kittenalexis68
23.06.2019 •
Mathematics
Assume the random variable x is normally distributed with mean p=85 and standard deviation =4. find the indicated probability p(x< 81)=
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Ответ:
0.16
Step-by-step explanation:
81 is 1 standard deviation below the mean. According to the empirical rule, 68% of data lies within 1 standard deviation of the mean; here the equivalent statement would be that half of that, or 34%, lies within 1 standard deviation below the mean. Half of the area under the standard normal curve, less this 0.34, is the probability that the random variable is below 1 standard deviation beneath the mean. That comes to 0.16.
On a calculator, you might enter the command normalcdf(-100,81,85,4); on my old TI-83 Plus I get 0.1587, which rounds off to 0.16.
Ответ:
The answer is composition of reflections and rotation
Step-by-step explanation:
I guessed this question one the section 4 test yourself and got it right