statistics
posted by Sally .
a. A statistics practitioner randomly sampled 100 observations from a population with a standard deviation of 5 and found that x is 10. Estimate the population mean with 90% confidence.

statistics 
MathGuru
Formula:
CI90 = mean + or  1.645(sd/√n)
sd = standard deviation
n = sample size
Substitute the values from your problem into the formula and calculate.
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