4-47. The compressive strength of samples of cement can be modeled by a normal distribution with a mean of 6000 kilo- grams per square centimeter and a standard deviation of 100 kilograms per square centimeter. (a) What is the probability that a sample's strength is less than 6250 Kg/cm2? (b) What is the probability that a sample's strength is between 5800 and 5900 Kg/cm2?

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4-47. The compressive strength of samples of cement can
be modeled by a normal distribution with a mean of 6000 kilo-
grams per square centimeter and a standard deviation of 100
kilograms per square centimeter.
(a) What is the probability that a sample's strength is less than
6250 Kg/cm??
(b) What is the probability that a sample's strength is between
5800 and 5900 Kg/cm2?
Transcribed Image Text:4-47. The compressive strength of samples of cement can be modeled by a normal distribution with a mean of 6000 kilo- grams per square centimeter and a standard deviation of 100 kilograms per square centimeter. (a) What is the probability that a sample's strength is less than 6250 Kg/cm?? (b) What is the probability that a sample's strength is between 5800 and 5900 Kg/cm2?
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