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?

Transcribed Image Text:

IQs of 7th Grade Students 70 60 50 58 42 40 D 40 31 30 20 10 0 13 60 70 80 90 100 110 120 130 140 150 160 IQ Scores