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3 years ago

Plz can you help me out with this question..

Mathematics

1 answer:

Kipish [7]3 years ago

4 0

Answer:

86%

Step-by-step explanation:

The mean is calculated as

mean = $\frac{sum}{count}$

The sum for the class is calculated as

$\frac{sum}{30}$ = 70 ( multiply both sides by 30 )

sum = 2100

The sum of the 20 boys is

$\frac{sum}{20}$ = 62 ( multiply both sides by 20 )

sum = 1240

The sum for the 10 girls is therefore 2100 - 1240 = 860

Thus the mean mark for the girls is

mean = $\frac{860}{10}$ = 86%

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