with a height of 68in , Ronald was the shortest president of a particular club in the past century. The club presidents of the past century have a mean height of 71.4 in and a standard deviation of...

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Given a normal random variable X with the mean 62 and a standard deviation 3, find Pr[X≤66.86]

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I need to find one, two and three standards deviations above the mean over 14.88 and one,two and three below this mean. The standard deviation in this equation is 2.8

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The lifetimes of a colour TV picture tube is normally distributed, with a mean of 8 yrs and a standard deviation of 2 years. (i) What is the probability that a picture tube will last more than 10...

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A certain group of tests subject had pulse rates with a mean of 77.1 beats per minute and standard deviation of 12.6 beats per minute. Would it be unusual for one of the test subjects to have a pulse...

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IQ test scores are normally distributed with a mean of 100 and a standard deviation of 15. Find the x-score that corresponds to a z-score of 1.96.

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The mean height of adult men in the Dinaric Alps is 73 inches with a standard deviation of 3 inches. If the average height for the adult american man is 69 inches, what percent of adult men in the...

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explain a person's score of 2.5 standard deviations above the mean on a test?

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Tommy Wait’s times between pitches is normally distributed with a mean of 36 sec. and a standard deviation of 2.5 sec. What percentage of his times between his pitches are 30 and 34 seconds? Please...

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a) to the right of x = 58 b) to the left of x = 24 Please show graphs if you can!!

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how to find assumed mean while solving problems like standard deviation or finding mean by direct method?