Question

-- 80 bulbs are selected at random from a lot and their life time (in hrs) is recorded in the form of a
frequency table given below:
Life time in
hours)
frequency
300
500
700
900
1100
10
12
23
25
10
ob
from the lot find the probability that its life is 1150 hours and fi​

Answer 1

Answer:

Number of bulbs having life less than 900 hours = 10 + 12 + 23 = 45. P (a bulb has life less than 900 hours) = 45/80 = 9/16 ...