Answer: 27.64601535159
Step-by-step explanation:
circumferenceC=πd
C=π×8.8
C=8.8π
C=27.64601535159
Answer:
And we can find this probability with the normal standard table or excel and we got:
And for this case is not neccesary applt the finite population correction factor since the distribution for the random variable is assumed known and normal
Step-by-step explanation:
Previous concepts
Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".
The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".
Solution to the problem
Let X the random variable that represent the length of time of a population, and for this case we know the distribution for X is given by:
Where
and
We are interested on this probability
And the best way to solve this problem is using the normal standard distribution and the z score given by:
If we apply this formula to our probability we got this:
And we can find this probability with the normal standard table or excel and we got:
And for this case is not neccesary applt the finite population correction factor since the distribution for the random variable is assumed known and normal
(11/12) / (2 5/8) = ...turn mixed numbers to improper fractions
(11/12) / (21/8) = ...when dividing fractions, flip what u r dividing by, then multiply
11/12 * 8/21 = 88/252 reduces to 22/63