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What percentage of observations from a standard normal distribution are below a z-value of 2.15?
What percentage of observations from a standard normal distribution are above a z value of 2.15?
What percentage of observations from a standard normal distribution are above a z value of
2.15?
What percent of observations from a standard normal distribution are between -2.15 and 2.15?
Based on your answers to the above questions, list two facts that you notice about the standard
normal distribution. Each fact is worth 2 points. (Please write your answer in complete
sentences.)
The average number of milligrams of sodium in a certain low-salt microwave frozen dinners is
540 mg, and the standard deviation is 35 mg. Assume the variable is normally distributed.
If a single dinner is selected, find the probability that the sodium content will be more than 550
mg.
If a sample of 10 dinners is selected , find the probability that the mean of the sample will be
larger than 550 mg.
8.
Why is the probability for question #6 is greater than that for question #7. (Please write your
answer in complete sentences.)
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