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The table gives information about the times taken, in minutes, by 22 students to
cycle a race.
Time (t minutes)
15 20 25 30 Frequency
4
1
7
10
Work out an estimate for the mean time.
Give your answer in minutes and correct to 3 significant figures.

Respuesta :

grahamkeystone
1020253041
So yeah lol

Answer: 27.7

Step-by-step explanation:

Find the mid point of each class interval.
for example: 15 20 = 17.5

Times the mid points by the frequency

17.5 x 4 = 70

22.5 x 1 = 22.5

27.5 x 7 = 192.5

32.5 x 10 = 325

325+192.5+22.5+70= 610

To find mean

610 / 22 = 27.7

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