Answer:
The probability of a bulb lasting for at most 606 hours is 0.9032
Step-by-step explanation:
The mean lifetime of a bulb is 580 hours.
The standard deviation of the lifetime is 20 hours
We are supposed to find the probability of a bulb lasting for at most 606 hours i.e.
Formula :
Z=1.3
Refer the z table
Hence the probability of a bulb lasting for at most 606 hours is 0.9032
the asnwer to your question is 27
Answer:
you use points to post questions so technically yes because only 2 answers are needed and when you use 10 points 5 points are given to each person who answers and only 2 people can answer
Step-by-step explanation: