Question

If the arithmetic mean of the observations 30, 40, 50, x, and 70 is 50 . Calculate the value of x:

• A. 55
• B. 70
• C. 60
• D. 65

Answer 1

Answer:

C. 60

arithmetic mean = (sum of observations)/ (number of observations) 50 = (30 + 40 + 50 + x + 70)/5 50 = (190 + x)/5 250 = 190 + x x = 60