Question

If mean of 10 numbers is 25. Given that one of the numbers is 70, find the mean of the other 9 numbers
A. 95

B. 45

C. 20

D. 7​

Answer 1

Answer:

20

Step-by-step explanation:

Given,

Mean of 10 numbers =25

Total Numbers =25 ×10=250

One of the number = 7⃣0⃣

then, Sum of other 9 =250-70=180

Mean of the rest 9 numbers = 180/9 =20

Answer 2

Answer:

C. 20

Step-by-step explanation:

The ten numbers will be : 70, X1, X2, X3, X4, X5, X6, X7, X8 and X9

Mean = (Sum of all terms) ÷ (No. of terms)

25 = (70+X1+X2+X3+X4+X5+X6+X7+X8+X9) ÷ 10

25 = (70 ÷ 10) + (X1+X2+X3+X4+X5+X6+X7+X8+X9)÷10

25 = 7 + (X1+X2+X3+X4+X5+X6+X7+X8+X9) ÷ 10

10(25 - 7) = X1+X2+X3+X4+X5+X6+X7+X8+X9

180 = X1+X2+X3+X4+X5+X6+X7+X8+X9

Hence, the sum of other 9 terms is 180

Mean = (Sum of all terms) ÷ (No. of terms)

Mean = 180 ÷ 9 = 20

Hence, the mena of other 9 numbers is 20

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