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Answer:
a) P=0.998
b) P=0.879
c) P=0.268
Step-by-step explanation:
The mean charges per passenger are:

The standard deviation is known to be σ=$25.
If the sample size is 60, we have to calculate:
a) the probability the sample mean will be within $10 of the population mean cost per flight.
This can be calculated from the z-value for a margin or error of 10 from the mean:


b) the probability the sample mean will be within $5 of the population mean cost per flight.
This can be calculated from the z-value for a margin or error of 5 from the mean:


c) the probability the sample mean will exceed $100
Again we will calculate the z-score for X=100.


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Answer:
x+2y = 5
2x+y=4
->
x+3y = 5
6x-y = 11
->
2x+y=10
x-3y=-2
Step-by-step explanation:
solutions of x and y for each system of equation can be solved by graphing
graph the two equations, and the intercepts of the two equations would be the x and y-values, aka the answers
if there are no intercepts, the equations have no solution