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Math · Statistics And Probability
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(b) P(0.35 S 0.73) (c) Find the mean of j. (d) Calculate the standard deviation of p. Check Let X be the lifetime of an electronic device it is known that the average lifetime of the device is 706 days and the standard deviation is 111 days. Let be the sample mean of the lretimes of 160 devices The distribution of X is unknown, however. the distribution of r should be approximately normal according to the Central Limit Theorem Calculate the following 300 probabilities using the normal approximation stion (a) P 692) (b) P(r 718) (c) P(693 s s 714) Check Suppose that measurements of your syst blood pressure are normally distributed with some unknown mean wand the known standard deviation a 6.9
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