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Read values from a histogram

DIFFICULTYintrostandardchallengeexam
Question 1 of 8

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Histogram of Typing speed (wpm), columns from 20–29 to 60–69, with frequency on the vertical axis. Frequencies: 20 to less than 30: 1; 30 to less than 40: 1; 40 to less than 50: 3; 50 to less than 60: 9; 60 to less than 70: 15.05101520203040506070Typing speed (wpm)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 50–59?

(b)1 mark

Which interval is the modal interval?