The manufacturing cost of a cell phone was $136. Sellers first marked up the cost by 25 percent. Sales were poor, so sellers dec
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Answer:
So we want to find this probability:
And using the normal standard distirbution or excel we got:
Step-by-step explanation:
Let X the random variable that represent the age of men married of a population, and for this case we know the distribution for X is given by:
Where and
We are interested on this probability
The sample size is n =66. We can use the z score to solve this problem:
If we find the z score for 25 we got:
So we want to find this probability:
And using the normal standard distirbution or excel we got: