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CBSE Class 10 Answered

find the mean of 20 numbers such that if the mean of 8 of them is 10 and the mean of 10 of them is 12 the last two numbers are 8 and 12

Asked by amulya2194 | 17 Apr, 2022, 04:46: PM
Expert Answer
Sum of all 20 numbers
= Sum of first 8 numbers + Sum of next 10 numbers + 8 + 12
= (8 x 10) + (10 x 12) + 20 
= 80 + 120 + 20
= 220
 
Mean of 20 numbers = 220/20 = 11
Answered by Renu Varma | 18 Apr, 2022, 10:50: AM
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