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160 Answered Questions for the topic Standard Deviation

Standard Deviation

03/31/14

find Pr[X=66.86]

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

03/11/14

i do not know how to sart this questio kindly help me

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... more
Standard Deviation Statistics Question

02/22/14

What is the minimum "usual" value equal beats per minute?

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... more
Standard Deviation

02/18/14

I need to find one, two and three standards deviations above the mean over 14.88 and one,two and three below this mean

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
Standard Deviation Mean

01/26/14

standard deviation

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.
Standard Deviation

12/16/13

Percentage via standard deviation

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... more
Standard Deviation

10/26/13

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

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

03/20/13

Determine the area under a normal distribution graph with a mean of 55 and a standard deviation of 7?

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

03/20/13

How to find a percentage from standard deviation and mean?

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... more
Standard Deviation

12/01/12

any rules applied to find assumed mean

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