Question

Find the mean of 32 numbers, such that if the mean of the first 10 number is 15 and the mean of the first 20 numbers is 11.The last two numbers are 10

Answer 1

Answer:

390 upon 32

Step-by-step explanation:

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Answer 2

Answer:

The given mean of 10 numbers = 15

So, Mean of 10 numbers = sum of observations/ no. of observations

15 = sum of observations / 10

Sum of observations of 10 numbers = 150

Similarly, Mean of 20 numbers = sum of observations/ no. of observations

11 = sum of observations / 20

Sum of observations of 20 numbers = 220

Hence, Mean of 32 numbers = (sum 10 numbers+sum of 20 numbers +sum of last two numbers)/ no. of observations

Mean of 32 numbers = (150 +220 + 20 ) / 32 = 390 /32 = 12.188

Step-by-step explanation: