Q. 8 : If the mean of 4 numbers, 2,6,7 and a is 15 and also the mean of other 5 numbers, 6, 18 , 1, a, b is 50. What is the value of b?
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15
SOLUTION :-
Mean = sum of observations / no. of observations
15 = (2 + 6 + 7 +a)/4
15 = (15 + a) / 4
15 * 4 = 15 + a
60 – 15 = a
a = 45
Similarly, Mean = sum of observations / no. of observations
50 = (18 + 6 + 1 +a + b)/5
50 = (18 + 6 + 1 +45 + b)/5
50 = (70 + b)/5
250 = 70 + b
b = 250 – 70 = 180
So, The value of b = 180.
Answered by
3
Answer:180
Step-by-step explanation:
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