The number of child births recorded in 50 maternity centres of a local government in August 1993 are as follows :

50 99 81 86 69 85 93 63 92 65 77 74 76 71 90 74 81 94 67 75 95 81 68 105 99 68 75 75 76 73 79 74 80 69 74 62 74 80 79 68 79 75 75 71 83 75 80 85 81 82

(a) Construct a frequency distribution table, using class intervals 45 - 54, 55 - 64, etc.

(b) Draw the histogram for the distribution 

(c) Use your histogram to estimate the mode.

(d) Calculate the mean number of births.