The mean preparation fee h& r block charged retail customers last year was $183 (the wall street journal, march 7, 2012). use this price as the population mean and assume the population standard deviation of preparation fees is $50.
a. what is the probability that the mean price for a sample of 30 h& r block retail customers is within $8 of the population mean?
b. what is the probability that the mean price for a sample of 50 h& r block retail customers is within $8 of the population mean?
c. what is the probability that the mean price for a sample of 100

a) 62%

b) 74%

c) 89%

Step-by-step explanation:

Given :

Mean,

Standard Deviation,

Solution :

a)

= 0.61916

= 62 % (Approx)

b)

= 0.7421

= 74 % (Approx)

c)

= 0.8904

= 89 % (Approx)

For more information, refer the link given below

link

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4

- both graphs increase on their domain.

- the graphs of both functions have the same x-intercept.

- neither graph has a y-intercept.