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A normal population has a mean of 78 and a standard deviation of 6.

Statistics
Tutor: None Selected Time limit: 0 Hours

You select a sample of 50.

Compute the probability the sample mean is :(Round z values to 2 decimal places and final answer to 4 decimal places ) 

a) Less than 77

probability 

b) Between 77 and 79

probability 

c)Between 79 and 80

Probability 

d) Greater than 80

Probability 

Apr 4th, 2015

a. Find the z value of this, round to two decimal places.

b. Add areas of z values provided by a and d. 

Same with c

d. Standard deviation = 78/sqrt of 50

(80-78)/(78/sqrt of 50)=z value,

Then use the table to find the corresponding value.

Sorry I have an emergency right now. You can ask me any questions you like about this, I have to submit this now or else I will be in bad situation, I hope you understand, thanks.


Apr 4th, 2015

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