Question : Study the bar graph and answer the question.
The number of neon lamps having a life of 600 hours or more but less than 800 hours is what percentage of the total number of neon lamps having a life of 800 hours or more?
Option 1: 66.67%
Option 2: 67.50%
Option 3: 69.25%
Option 4: 68.75%
Correct Answer: 68.75%
Solution :
The number of lamps having a life of 600 hours or more but less than 800 hours is = 75 + 90 = 165
Number of lamps having a life of 800 hours or more = 80 + 70 + 55 + 35 = 240
Required percentage $=\frac{165}{240} × 100 = 68.75\%$
Hence, the correct answer is 68.75%.
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