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Read values from a histogram

DIFFICULTYintrostandardchallengeexam
Question 1 of 8

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Histogram of Wait time (minutes), columns from 0–9 to 40–49, with frequency on the vertical axis. Frequencies: 0 to less than 10: 16; 10 to less than 20: 10; 20 to less than 30: 4; 30 to less than 40: 1; 40 to less than 50: 1.0510152001020304050Wait time (minutes)Frequency

The values are recorded as whole numbers. Class labels list the included records; each next lower boundary begins a new class

(a)1 mark

What is the frequency for the interval 20–29?

(b)1 mark

Which interval is the modal interval?