the percentage of tubes ,lifetime of which are greater than or equal to 900 hours(hint: 800-899 hrs= 62 tubes,900-999=48tubes,1000-1099=22 tubes)
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We can write down the inequality as follows.
Let x be the number of tubes more than or equal 900hrs.
The maximum number of hrs is 1099.
Therefore :
900 ≤ x ≤ 1099
The value of x will be :
(900 - 999 =48) + (1000 - 1099 = 22) = 70
The total number of tubes :
70 + 62 = 132
70/132 × 100 = 53.03%
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