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We shall obtain the values of z from the standard normal tables.
If the area between -z and z is 0.9282 it implies that the area to the left of -z is . Thus
Here, we find the value such that
. This implies that, where, is the table value associated with 0.90. From tables,
Therefore, the probability that one can assemble the desk in less than 71.4349344 minutes is 0.90