IQ Scores The following frequency histogram represents the

Chapter 2, Problem 11E

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QUESTION:

The following frequency histogram represents the IQ scores of a random sample of seventh-grade students. IQs are measured to the nearest whole number. The frequency of each class is labeled above each rectangle.

(a) How many students were sampled?

(b) Determine the class width.

(c) Identify the classes and their frequencies.

(d) Which class has the highest frequency?

(e) Which class has the lowest frequency?

(f) What percent of students had an IQ of at least 130?

(g) Did any students have an IQ of 165?

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QUESTION:

The following frequency histogram represents the IQ scores of a random sample of seventh-grade students. IQs are measured to the nearest whole number. The frequency of each class is labeled above each rectangle.

(a) How many students were sampled?

(b) Determine the class width.

(c) Identify the classes and their frequencies.

(d) Which class has the highest frequency?

(e) Which class has the lowest frequency?

(f) What percent of students had an IQ of at least 130?

(g) Did any students have an IQ of 165?

ANSWER:

Step 1 of 7

(a)

The following frequency histogram represents the IQ scores of a random sample of seventh-grade students.

We are asked to find the number of students sampled.

The total number of students will be the sum of the frequency of each bar in the graph.

The total number of students were sampled

= 2 + 3 + 13 + 42 + 58 + 40 + 31 + 8 + 2 + 1 = 200

Hence 200 students were sampled.

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