0.12y-1=0.095-0.9
or, 0.12y=0.095-0.9+1
or, 0.12y=0.195
or, y = 0.195/0.12 = 195/120=1.625
The answer will be 1.625
Answer:
116,160
Step-by-step explanation:
22 times 5,280= 116,160
There's 5,280 feet in a mile
Answer:
151 students must be selected.
Step-by-step explanation:
We have that to find our level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of .
That is z with a pvalue of , so Z = 1.96.
Now, find the margin of error M as such
In which is the standard deviation of the population and n is the size of the sample.
The population standard deviation is known to be $25.
This means that
How many students must be randomly selected to estimate the mean weekly earnings of students at one college? Sample mean within $4 of the population mean
This is n for which M = 4. So
Rounding up:
151 students must be selected.