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Could the following sample reasonably have been drawn from a normal population with a mean of...

Could the following sample reasonably have been drawn from a normal population with a mean of 20 and standard deviation of 1.5 using a = 0.01 2 tail ?

X: 21, 21, 21, 20, 22, 20, 22?

yes

no

cannot be tested with z test

The correct answer cannot be determined from the information provided.
math   Statistics-And-Probability   
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