The runner gets a total of minutes of 32, 44, 56, 43. What minute should the runner reach to have an overall average of at least 40 minutes?
Correct! Wrong!
To find the average of a set of values, add the values together and then divide by the total number of values. We need to include the unknown value which is X. In this case we have (32+44+56+43+X)/5 = 40. 175+X = 40 x 5; 175+X = 200 ; X=200-175; X = 25. The runner needs 25 minutes in order to get an average of at least 40 minutes.