Question

Find the mean of 25 numbers, if the mean of 15 of them is 18 and the mean of remaining numbers is 13. A) 26 B) 44 C) 39 D) 16

Answer 1

Answer:

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Mean of 15 of them = 18

Sum of 15 number = 15×18

= 270

Mean of reaming number = 13

Reaming numbers = 25-15

= 10

Sum of 10 numbers = 13×10

= 130

Total = 270+130

= 400

Mean of 25 number = 400/25

= 16

Hence proved

Step-by-step explanation:

Answer 2

$\huge\underline\pink{AnswEr}$

Mean of 15 of them = 18

Sum of 15 number = 15×18

= 270

Mean of reaming number = 13

Reaming numbers = 25-15

= 10

Sum of 10 numbers = 13×10

= 130

Total = 270+130

= 400

Mean of 25 number = 400/25

= 16

Hence proved