Abank manager wishes to estimate the average waiting time for customers in line for tellers. a random sample of 50 times is measured and the average waiting time is 5.7 minutes. the population standard deviation of waiting time is 2 minutes. which excel function would be used to construct a confidence interval estimate?
a. norm. inv
b. t. inv
c. int
d. confidence. norm

d) CONFIDENCE.NORM

Step-by-step explanation:

Given that a bank manager wishes to estimate the average waiting time for customers in line for tellers.

A random sample of 50 times is measured and the average waiting time is 5.7 minutes.  n =50: mu = 5.7 and sigma = 2

To construct a confidence interval we use excel function as

d) CONFIDENCE.NORM

a) is wrong because this is to get normal x value

b ) is to get left tailed t inverse value

c) INT is to get the integer part of a decimal number

Option d is right

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c

show da graph

step-by-step explanation: