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A manufacturing process makes rods that vary slightly in length but follow a normal distribution with...

A manufacturing process makes rods that vary slightly in length but follow a normal distribution with mean length 25 cm and standard deviation 2.60. What is the probability of randomly selecting a rod that is shorter than 22 cm?

P(X<22)=P(Z<  ) =

Round your z-score and probability to four decimal places.

The time a song plays on the radio varies from song to song. The time songs play varies according to a normal distribution with mean of 3.2 minutes and a standard deviation of 1.32. What is the probability that a randomly selected song will play longer than 4.5 minutes?

P(X>4.5) = P(Z>  ) =

Round your z-score and probability to four decimal places.

math   Statistics-And-Probability   
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