SOLUTION: Suppose a random sample of size 36 is drawn from a population with a mean of 277. If 91% of the time the sample mean is less than 279, what is the population standard deviation?
Algebra.Com
Question 1187197: Suppose a random sample of size 36 is drawn from a population with a mean of 277. If 91% of the time the sample mean is less than 279, what is the population standard deviation?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
91st percentile z=1.34
z=(x-mean)/sigma/sqrt(36)
1.34=(279-277)/sigma/6
1.34=12/sigma
sigma=8.95, the answer.
The sd of the sample is 8.95/6 or 1.49
RELATED QUESTIONS
Suppose a random sample of size 36 is drawn from a population with a mean 278. If with... (answered by ewatrrr)
Suppose a random sample of 36 is selected from a population with a standard deviation of... (answered by Boreal)
I need the answer to the following problem, if possible show work so that I can see how... (answered by oscargut)
a random sample of size 36 is taken from a population whith mean of 50 and standard... (answered by tommyt3rd)
looking for some help I need to type the question out because I an short some key on my... (answered by stanbon)
Suppose 40% of a student population works part time. If a random sample size of 300... (answered by rothauserc)
a.
A random sample of 25 was drawn from a normal distribution... (answered by stanbon)
Suppose a random sample of 50 values is taken from a normal population with standard... (answered by ewatrrr,stanbon)
given the mean of 100 and the standard deviation of 30 for a normally distributed... (answered by stanbon)