Question

A frequency distribution of the life times of 400 T.V. picture tubes tested in a tube company
Find the average life of the tube
Life time (in hours)
300 399
400 499
500-599
600 699
700-799
Frequency
46
58
76
68
Life time in hours)
800 899
900-999
1000-1099
1100-1199
Frequency
62
48
22
6​

Answer 1

Answer:

this question seems to be incomplete.

Step-by-step explanation:

Answer 2

Answer:

= 749.5 + 100 × (-138/400) = 749.5 – 138/4 = 749.5 – 34.5 = 715 Hence, the average life time of a tube is 715 hours