12.3-12.4 Written Practice

Be sure to show your work as you answer each question. An answer on its own

(without an equation, expression, or work shown) will not be considered.

Consider the following three data sets A, B and C.

A = {9,10,11,7,13}

B = {10,10,10,10,10}

C = {1,1,10,19,19}

1) Calculate the range of each data set. (label each answer as A, B, or C)

2) Calculate the mean of each data set. (label each answer as A, B, or C)

3) Calculate the standard deviation of each data set. (round to tenths place if

needed; label each answer as A, B, or C)4) Which set has the largest standard deviation?

Which set has the smallest?

5) Is it possible to answer question #4 without calculations of the standard

deviation? Explain.

6) If the standard deviation of a given data set is equal to zero, what can

we say about the data values included in the given data set?

7) The frequency table of the monthly salaries of 20 people is shown below.

Salary frequency

$3500 5

$4000 8

$4200 5

$4300 2

Calculate the measures of center for the salaries of the 20 people.

A) mode

B) median

C) mean