4) Find the mean of 25 numbers, if mean of 10 data is 13 and mean of remaining numbers is 18.
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Answered by
4
Answer:
Mean of 10 numbers =13
∴Sum of numbers =13×10=130
Mean of remaining 15 numbers =18
∴Sum of numbers =15×18=270
∴Sum of all numbers =130+270=400
∴Mean = sum of numbers/25=400/25=16
Hence the mean of 25 numbers is 16.
Answered by
6
Sum of numbers
=
13×
10=
130
15
numbers
=
18
∴
Sum of numbers
=
15×
18=
270
∴
Sum of all numbers
=
130+
270=
400
∴
Mean = sum of numbers/
25=
400/25=
16
25
16
Mean of 10 numbers
=
13
thank u for asking
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