The useful life of a certain valve at a pumping station is normally distributed with a mean of 48 months and a standard deviation of five months.Determine these probabilities:
(i)The valve will fail within 44 months of its installation.(ii)The valve will last at least 40 months,before failing.

Question

The useful life of a certain valve at a pumping station is normally distributed with a mean of 48 months and a standard deviation of five months.Determine these probabilities:
 (i)The valve will fail within 44 months of its installation.(ii)The valve will last at least 40 months,before failing.

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The Answer of The useful life of a certain valve at a pumping station is normally distributed with a mean of 48 months and a standard deviation of five months.Determine these probabilities:
 (i)The valve will fail within 44 months of its installation.(ii)The valve will last at least 40 months,before failing.

The Useful Life of a Certain Valve at a Pumping