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primary 6 | Maths | Data Analysis
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primary 6 Maths Data analysis Singapore

Sos

Date Posted: 3 years ago

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Kamala

3 years ago

average of n numbers = 124.5
sum = 124.5 * n

Keyed 135 instead of 153

sum = 124.5*n - 135 + 153
sum = 124.5*n + 18

actual average = 129
sum = 129*n

124.5*n + 18 = 129*n
129n - 124.5n = 18
4.5n = 18
n = 18/4.5 = 4

4 numbers were there.

Sstrike

3 years ago

Ans: 4

153-135 = 18
129-124.5 = 4.5
18÷4.5 = 4 (Ans)

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