Answer:
± 25
Step-by-step explanation:
Answer:
exact form: is 7/7e and decimal form: it is 0.00638317...
Step-by-step explanation:
d o not know step by step can you help me
Well, you're asked to simply grab the second version of that amount, or balance, and provide a common factored version of it, is all
so
Answer:
y
>
4
3
Step-by-step explanation:
Answer:
a)
b)
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".
Let X the random variable that represent the mean life span of a brand name tire, and for this case we know the distribution for X is given by:
Part a
We want this probability:
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:
Part b
Let represent the sample mean, the distribution for the sample mean is given by:
On this case
We want this probability:
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: