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Find the mean of 25 observations if the mean of 15 of them is 18 and that if remaining ones is 13
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Multiply 15 with 18=370
and then multiply 13 with 10=130
add them 130 + 370 = 500
so the mean will be 500/25=20
and then multiply 13 with 10=130
add them 130 + 370 = 500
so the mean will be 500/25=20
helper22:
its 270
15x18 is 270
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here is the solution to this problem....
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