The population mean () blood levels of lead of children who live in a city is 11.93

Question:

The population mean () blood levels of lead of children who live in a city is 11.93 with a standard deviation of 3. For a sample size of 9, what is the probability that a mean blood level will be:

a. Between 8.93 and 14.93

b. Below 7.53

c. Above 16.43

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