keigleyhannah30
12.07.2019 •
Mathematics
According to an irs study, it takes a mean of 330 minutes for taxpayers to prepare, copy, and electronically file a 1040 tax form. this distribution of times follows the normal distribution and the standard deviation is 80 minutes. a consumer watchdog agency selects a random sample of 40 taxpayers. a. what is the standard error of the mean in this example? b. what is the likelihood the sample mean is greater than 360 minutes?
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Ответ:
0.0089
Step-by-step explanation:
Given : Mean :
Standard deviation :
Sample size :
We know that the standard error of the mean is given by :-
The formula to calculate the z-score :-
For x = 360
The p-value =
Hence, the likelihood the sample mean is greater than 360 minutes= 0.0089
Ответ:
Your answer will be C. There is a whole in the negative side of the graph