Question

If the mean of 4 numbers 2, 6, 7 and "a" 15 and also mean of other 5 number 6,
18, 1. a, b is 50. What is the value of b​

Answer 1

Answer:

Sorry for putting multiply symbol as (*). I am a pc user mate........

Explanation:

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.