80 bulbs are selected at random from a lot

+1 vote
1 view
asked Oct 12, 2018 in Class IX Maths by muskan15 (-3,247 points)

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

Find the probability that bulbs selected randomly from the lot has life less than 900 hours.

Please log in or register to answer this question.

1 Answer

0 votes
answered Oct 12, 2018 by priya12 (-12,158 points)

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

Related questions

+1 vote
1 answer
+1 vote
1 answer
+1 vote
1 answer