Mathematics 2014 JAMB Past Questions - Question 44: The mean of 2-t,4+t,3-2t,2+t and t-1 is

Correct Answer

D

Explanation

Mean X = Ex /n= < (2-t) + (4+t) +(3-2t) +(2+t) + (t-t) / 5= < 11 - 1 + 3t - 3t> / 5To find the mean of a set of numbers, we need to add up all the numbers and divide the sum by the total number of values.The given set of numbers is: 2 - t, 4 + t, 3 - 2t, 2 + t, and t - 1.To find the mean, we add up all the numbers:(2 - t) + (4 + t) + (3 - 2t) + (2 + t) + (t - 1)Simplifying the expression, we get:2 - t + 4 + t + 3 - 2t + 2 + t + t - 1Combining like terms, we have:(2 + 4 + 3 + 2 - 1) + (-t + t + t - 2t)Simplifying further, we get:11 - tNow, we divide the sum by the total number of values, which is 5:Mean = (11 - t) / 5Therefore, the mean of the given set of numbers is (11 - t) / 5.= < 11 - 1 + 3t - 3t> / 5= 10 / 5 = 2