# STT205

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STT205

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A. The sum of the frequencies of 16 and 18 in the table below is _____________

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B. Suppose there are 70 students in an examination with the students writing at least one of the subjects; Chemistry, Physics and Biology. Thirty(30) students offer Physics, 33 offer Chemistry and 40 offer biology, 10 students offer both Physics and Chemistry. Fourteen (14) of the students offer Physics and Biology, and 15 of them offer Biology and Chemistry. Find the number of students that offer all subjects

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C.
Given X1=20 and X2=-20. The arithmetic mean will be: ________


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D.
The population mean Î¼ is an example of a: _________



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E.
Scores that differ greatly from the measures of central tendency are called:_________



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F.  Which of these is closer to the mode for a skewed distribution?

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G.
The median is considered a robust measure because it is resistant to: ________



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H. The following are examples of discrete random variables except

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I. An impossible event has the probability ______

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J. Which of the following statement does not represent a role of statistics in the society?

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K.
When the values in a series are not of equal importance, we calculate the: _____________



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L.
The arithmetic mean of 10 items is 4 and the arithmetic mean of 5 items is 10. The combined arithmetic mean is: ______


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M. What is the probability of not getting a 1 in the toss of a single die?

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N. The empirical relationship between the mean and median is given by; mean �?? mode = x(mean �?? median) in the table below . Then x is _________________

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O. What is the relative cumulative frequency of 50 in the table below

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P.
The midpoint of the values after they have been ordered from the smallest to the largest or the largest to the smallest is called:____



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Q.
Step deviation method or coding method is used for computation of the______



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R. The square root of the sum of deviations of a set of numbers from their arithmetic mean is ___________

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S.
Ten families have an average of 2 boys. How many boys do they have together?


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T. ____ is not an advantage of secondary data

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U. What is the cumulative frequency of 40 in table below?

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V.
When all the values in a series occur the equal number of times, then it is not possible to calculate the:__________



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W. The difference between the harmonic mean of 2, 4, 8 and their geometric mean is __________

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X.
If a constant value is added to every observation of data, how would the value of the arithmetic mean behave? ________



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Y.
The sample mean X- is an example of a: ________________



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Z. Calculate the standard deviation of the set of data in the table below 27 / 70

AA. The addition rule of probability is used for ___ events

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AB.
The elimination of extreme scores at the top of the set has the effect of:_________



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AC.
What effect will the elimination of extreme scores at the bottom of a data set have on the mean? ______



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 If the smallest observation in a data is decreased, the average which is not affected is: ____



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AE.
If âˆ‘i=110Xi-50=100 then sample mean X- will be: ________



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AF. The square root of the sum of deviations of a set of numbers from their arithmetic mean is

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AG. A Poisson distribution is given by [p(x)=frac{0.72^{x} e^{-0.72}}{x!}]. Calculate the variance

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AH.
If the arithmetic mean of the two numbers X1 and X2 is 5 if X1=3, then X2 is:_________


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AI. ____ is not an axiom of probability

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AJ.
 The first step in calculating the median of a discrete variable is to determine the: _______



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AK. What is the geometric mean of 3, 5, 6, and 7

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AL. Which of the following is not a source of data?

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AM. A set of data with only one mode is said to be __________

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AN. A characteristics that assumes different values for different entities is called __________________

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AO.
The total of all the observations divided by the number of observations is called: ______



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AP. What is the range of the set of data in the below

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AQ. The first step involved in constructing a group frequency distribution is to _________ (a) (b) count the number of items

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AR.
The frequency distribution of the hourly wage rate of 60 employees of a paper mill is as follows: The mean wage rate is:N______



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AS. A student scored 45% in MTH101, 62% in MTH102, 30% in BUS103, and 70% in ACC101. Find his GPA if the respective credits are 3, 2, 2, 3

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AT. Calculate 70% of the mean of the set of data in the table below 47 / 70

AU.
The sum of the squares of the deviations about mean divided by the number of observations is: ________



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AV. A frequency curve of a normal distribution is ____ shaped

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AW. If the mode of the distribution is X the [frac{X}{2}] in the table below is _____________

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AX. Suppose there are 70 students in an examination with the students writing at least one of the subjects; Chemistry, Physics and Biology. Thirty(30) students offer Physics, 33 offer Chemistry and 40 offer biology, 10 students offer both Physics and Chemistry. Fourteen (14) of the students offer Physics and Biology, and 15 of them offer Biology and Chemistry. How many students offer only Biology

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AY. Primary data is not collected through ___________

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AZ. The 75th percentile is the same as the ____ quartile

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BA. Any arrangement of r objects selected from a single group of n possible objects is called a ___________

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BB.
The sum of the squares of the deviations of the values of a variable is least when the deviations are measured from: ____________



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BC. In an examination the score obtained is weighted 3 times as much as a test score. If a student scored 85% in the examination with a test score of 90%, what is his mean score

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BD.
 If the arithmetic mean of 20 values is 10, then sum of these 20 values is:_____


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BE. There are 5 different items to be stocked in a store with 3 bins for the storage. What are the possible number of arrangements?

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BF. What is the sum of the medians of {3, 4, 4, 5, 6, 8, 8, 10} and {5, 5, 7, 9, 11, 12, 15, 18}

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BG. If at least one of the events of an experiment can occur, then they are said to be ________ events

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BH.
The sum of deviations taken from mean is: _______________


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BI. 36. If 5, 8, 6 and 2 occur with frequencies 3, 2, 4 and 1 respectively, find the mean

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BJ. _____ is the degree of peakness of a distribution

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BK. ______ is not a measure of dispersion

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BL.
The sum of deviations is zero when deviations are taken from:________



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BM.
Sum of absolute deviations of the values is least when deviations are taken from: ________



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BN. ____ statistics deals with methods of organizing, summarizing and presenting data in an informative way

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BO.
Any measure indicating the Centre of a set of data, arranged in an increasing or decreasing order of magnitude, is called a measure of: ______



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BP.
The suitable average for qualitative data is: ________



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BQ.
The arithmetic mean is highly affected by: ________



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BR.
The mean of 10 observations is 10. All the observations are increased by 10%. The mean of increased observations will be: ______


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