Math 160 Midterm Review

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Provide an appropriate response. 1) The following frequency distribution analyzes the scores on a math test. Find the class boundaries of scores interval 40-59.
Scores 40-59 60-75 76-82 83-94 95-99 Number of students 2 4 6 15 5

1)

A) 39.5, 58.5

B) 40.5, 59.5

C) 39.5, 59.5

D) 40.5, 58.5 2)

2) The frequency distribution below summarizes employee years of service for Alpha Corporation. Determine the width of each class.
Years of service Frequency 1-5 5 6-10 20 11-15 25 16-20 10 21-25 5 26-30 3

A) 6

B) 4

C) 5

D) 10

1

3) The frequency distribution for the weekly incomes of students with part-time jobs is given below. Construct the corresponding relative frequency distribution. Round relative frequencies to the nearest hundredth of a percent if necessary.
Income ($) Frequency 200-300 60 301-400 73 401-500 91 501-600 89 More than 600 15 A) Relative Income ($) Frequency 200-300 18.29% 301-400 22.26% 401-500 27.74% 501-600 27.13% More than 600 4.57% C) Relative Income ($) Frequency 201-300 15.5% 301-400 22.1% 401-500 31.3% 501-600 16.2% More than600 14.9%

3)

B)

D)

Relative Income ($) Frequency 200-300 12.5% 301-400 20.1% 401-500 37.3% 501-600 15.2% More than 600 14.9% Relative Income ($) Frequency 200-300 27.33% 301-400 27.38% 401-500 4.60% 501-600 18.07% More than 600 27.41%

4) A nurse measured the blood pressure of each person who visited her clinic. Following is a relative-frequency histogram for the systolic blood pressure readings for those people aged between 25 and 40. The blood pressure readings were given to the nearest whole number. Approximately what percentage of the people aged 25-40 had a systolic blood pressure reading between 110 and 139 inclusive?

4)

A) 75%

B) 89%