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16.11.2020 •
Mathematics
The compressive strengths of 40 concrete cylinders have an estimated mean of 60.14 MPa and standard deviation of 5.02 MPa. Assuming the strength to be Normally distributed, what is the probability that 10 cylinders will each have strengths between 45 and 75 MPa?
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Ответ:
0.9972
Step-by-step explanation:
Let x be a random variable that represents the strength of concrete cylinders.
Given: The compressive strengths of 40 concrete cylinders have an estimated mean
of 60.14 MPa and standard deviation
of 5.02 MPa.
The probability that 10 cylinders will each have strengths between 45 and 75 MPa :
Hence, The required probability = 0.9972
Ответ:
your welcome