Question

The following is the distribution of bulbs kept in boxes:
Number of bulbs:
50 52
52-54
54-56
56-58
58-60
Number of boxes
15
100
126
105
30
Find the mean number of bulbs kept in a box. Which method of finding the mean did
you choose?
​

Answer 1

To find total fi (frequency) add all the frequencies and to find xi add the intervals and divide by 2 eg-
“50+52= 102/2 = 51 “
and to find fixi multiply the fi and xi with each other like-
“15x51 = 765 “and then find the total fixi


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