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Histograms Practice Questions

Question 1

3 marks

The table gives information about the times that 80 patients waited to see a nurse at a health centre.

Time (tt minutes) Frequency Frequency density
0<t≤100 < t \le 10 12
10<t≤1510 < t \le 15 21
15<t≤2515 < t \le 25 30
25<t≤4025 < t \le 40 12
40<t≤6040 < t \le 60 5
(a)

Complete the frequency density column in the table.

(b)

Write down the class interval that contains the median waiting time.

Question 2

3 marks

A farm shop sorts its apples by mass. The histogram gives information about the masses of the apples in one crate.

00.20.40.60.81.01.21.41.61.82.0050100150200Mass (w grams)Frequency density

(a)

Use the histogram to complete the frequency table.

Mass (ww grams) Frequency
0<w≤500 < w \le 50 10
50<w≤10050 < w \le 100
100<w≤120100 < w \le 120
120<w≤150120 < w \le 150
150<w≤200150 < w \le 200
(b)

Write down the total number of apples in the crate.