# The followi

To Find: Histogram for the data

Given: Data of lifetimes of 400 neon lamps.

Concept Used:

Histogram: a diagram consisting of rectangles whose area is proportional to the frequency of a variable and whose width is equal to the class interval.

Explanation:

(i) The above-given information is represented with the help of histogram below:

(ii) We will count the lamps with a lifetime of more than 700 hours.

We can see from the histogram; we have to add lamps which have a life times of (700 – 800), (800 – 900), and (900 – 1000)

74 + 62 + 48 = 184

Hence, 184 lamps have a lifetime of more than 700 hours.

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