Question

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?

• A. 24
• B. 25.5
• C. 25.9
• D. 26.3

Answer 1

Answer:

B. 25.5

(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