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Cerrena [4.2K]
3 years ago
7

Class A has 9 pupils and class B has 24 pupils.

Mathematics
1 answer:
hodyreva [135]3 years ago
6 0

Answer:

mean ≈ 25.45

Step-by-step explanation:

mean is calculated as

mean = \frac{sum}{count}

We require the sum for both classes

class A

mean = \frac{sum}{9} = 40 ( multiply both sides by 9 )

sum = 9 × 40 = 360

class B

mean = \frac{sum}{24} = 20 ( multiply both sides by 24

sum = 24 × 20 = 480

Total sum for both classes = 360 + 480 = 840 , then mean for both classes is

mean = \frac{840}{33} ≈ 25.45 ( to 2 dec. places )

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