Question

5) Life time of electric bulbs are given
in the following distribution. Find the
class mark of the modal class interval
Life time
(in Hours)
250-300
Number of
bulbs
Сл
300-350
14
21
350-400
400-450
12
450-500
10​

Answer 1

Answer:

Step-by-step explanation:

Class mark = 350+400/2

                    = 750/2

                    =325