A randomly selected value from a normal distribution is foun

A randomly selected value from a normal distribution is found to be 2.1 standard deviations above its mean. What is the probability that a randomly selected value from the distribution will be less than 2.1 standard deviations from the mean?

Solution

This is like asking the probability of z < 2.1.

Using a table/technology, the left tailed area of this is          
          
P(z <   2.1   ) =    0.982135579 [ANSWER, B]