Find a value c such that

P(-c < Z < c) = 0.6

where Z has a standard normal distribution.

You may use either the Z table or R to find the necessary percentile. Example: To find the 10th percentile for a standard normal distribution in R qnorm(0.1)

The q in the function if for quantile. A quantile is basically the same thing as a percentile except that we use area instead of percent. So the 10th percentile is equal to the 0.1 quantile. You don’t need it for this question, but to find the 10th percentile for a normal distribution with any mean and standard deviation the R command is qnorm(0.1,m,s)


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