Question

the following table gives the life time's 0f 400 neon lamps:​

Answer 1

Answer:

130 lambs have less than 600 hr

216 lambs have less than 700 hr

Answer 2

1) In the picture

2) Sorry don't know

3) Number of lamps having their life time more than 700 = number of lamps having life time in between 700 to 1000 = 700 to 800 + 800 to 900 + 900 to 1000

= 74+62 +48 = 184. ( In the 2 picture)

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