For one set the two equations equal to eachother and solve from there. 2 is 45
For three set the two equations equal. Same for four
Answer:
The distribution of average life time is approximately normallyl distributed with mean 20 hours and standard deviation of 0.4743 hours
Step-by-step explanation:
The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean
and standard deviation
, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean
and standard deviation
.
For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.
In this problem

The distribution of average life time is approximately normallyl distributed with mean 20 hours and standard deviation of 0.4743 hours
Answer:
Thank you very much LY
Step-by-step explanation:

is the answer I can also give you the graph to if you need it, but that's how you would graph it. : ) Let me know if you need the graph