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ACTIVITY 2

Lwando, a grade 12 learner at Springfontein Secondary School read a report on the 11 October 2016 that according to a national survey that was conducted 14.2% of primary school children are already overweight.

She decided to go to the local clinic to sample 15 boy infants who went for their routine check-up one Thursday. She randomly asked mothers what their 9-month old infants weighed after seeing the nurse, below are the results she obtained in kilograms (kg):

8 6

8.4 10.5 11.1 9

8.4

8.9 9

10

7.9

8.9

10

9.8

10

5.2.1 Calculate the mean weight of the infants.

(3)

5.2.2 Arrange the weights in descending order.

(2)

5.2.3 Determine the median weight of the infants.

(2)

5.2.4 Determine the modal weight of the infants.

(2)

5.2.5 How much more does the heaviest baby weigh than the lightest baby?

(2)

5.2.6 According to the boys' health chart, 9-month old boys weigh 8.4 kg on average:

(a) Determine the number of boys who are on average weight.

(2)

(b) Determine the number of boys who weigh more than the average weight.

(2)

Sagot :

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