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) 300 500 700 900 1100

Frequency 10 12 23 25 10

One bulb is selected at random from the lot. The probability that its life is 1150

hours, is:

(a) 1/80

(b) 7/16

(c) 0

(d) 1 Jo ​

Answer 1

Answer:

Total bulb in a lot, n (S) = 80 Number of bulbs whose life time is 1150, n(E) = 0 Probability that its life time is 1150 h = n(E)/n(S) = 0/80 = 0 Hence, the probability that its life time is 1150 is 0.Read more on Sarthaks.com - https://www.sarthaks.com/877425/bulbs-selected-random-from-and-their-life-time-recorded-form-frequency-table-given-below