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If the average of 5 observations x, x+1, x+2, x+3 and x+4 is 24, then the average of last 2 observations is?

A24

B25.5

C25.9

D26.3

Answer:

B. 25.5

Read Explanation:

(x+x+1+x+2+x+3+x+4) / 5 = 24 5x +10 = 24*5 5x +10 = 120 5x = 110 X = 110 / 5 X= 22 So the numbers are 22, 23, 24, 25 & 26 Required average = (25+26) /2 =51/2 =25.5


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