Customers of a phone company can choose between two service plans for long distance calls. The first plan has no monthly fee but
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Answer:
And we can find this probability using the normal standard distribution table and we got:
And the percentage faster than 13.28 seconds would be 91.9%
Step-by-step explanation:
Let X the random variable that represent the runtimes of a population, and for this case we know the distribution for X is given by:
Where and
We want to find this probability:
And we can use the z score formula given by:
Using this formula we have:
And we can find this probability using the normal standard distribution table and we got:
And the percentage faster than 13.28 seconds would be 91.9%
You find the slope of the line by using the formula where x1 and y1 is the first point, and x2 and y2 are the second point.