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The breaking strength X of a certain rivet used in a machine engine has a mean 5000 psi and standard deviation 200 psi.
Posted: Wed May 11, 2022 9:21 am
by answerhappygod
- The Breaking Strength X Of A Certain Rivet Used In A Machine Engine Has A Mean 5000 Psi And Standard Deviation 200 Psi 1 (76.78 KiB) Viewed 23 times
The breaking strength X of a certain rivet used in a machine engine has a mean 5000 psi and standard deviation 200 psi. A random sample of 36 rivets is taken. Consider the distribution of X, the sample mean breaking strength. (a) What is the probability that the sample mean falls between 4910 psi and 5090 psi? (b) What sample n would be necessary in order to have P(4970<X<5030) = 0.98? Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. < < = (a) The probability is (Round to four decimal places as needed.)