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
Answers
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2
Answer:
Step-by-step explanation:
Class mark = 350+400/2
= 750/2
=325
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