Answer :

**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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