What proportion of new typists need between a range

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A market research firm employs a large number of typists for data entry. The time it takes for new typists to learn the computer system is known to have a normal distribution with a mean time of 90 minutes and standard deviation of 18 minutes.

What proportion of new typists need between 1 and 2 hours to learn the computer system? P(60 ≤ X ≤ 120 min.)

Reference no: EM13123156

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