Q. 5.     The following table gives the life times of 400 neon lamps:

            

            (ii) How many lamps have a life time of more than 700 hours?

Answers (1)

Lamps having life time in the range 700 - 800 = 74

Lamps having life time in the range 800 - 900 = 62

Lamps having life time in the range 900 - 1000 = 48

Lamps having a life time of more than 700 hours = 74 + 62 + 48 = 184.

 

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