Question

the frequency distribution of the lifetimes of 400t.v. picture tube tested in tube company is given below: lifetime(in hours) 300--399,400--499,500--599,600--699,700--799,800--899,900--999,1000--1099,1100--1199
No.of pic tubes 14,46,58,76,68,62,48,22,6 find the average
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Answer 1

Explanation:

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