Question

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Answer 1

Answer:

See the Attachment

Step-by-step explanation:

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Wait wait somthing went wrong

your confirm answer is 9/16

Answer 2

Answer:

Frequency of Bulbs having life time less than 900 hrs :

Life Time Frequency

300 10

500 12

700 23

Total 45

Probability = 45/80 = 9/16