Question 5

 

The table shows the distribution of weights(N) of students in a class.

Weights (N)	40 - 46	47 - 53	54 - 60	61 - 67	68 - 74	75 - 81	82 - 88	89 - 95
Frequency	5	2	3	8	7	6	8	1

Using an assumed mean of 71, calculate, correct to one decimal place, the mean weight of the students.