Plz help me I will mark u brainiest
1 answer:
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Answer:
Option C
Step-by-step explanation:
We want to know the percentage of women among people who only prefer exercise.
We have the following information:
Diet Only Exercise Only Diet and Exercise
Men 7 28 15
Women 22 18 10
Then we get the total of people who prefer just exercise.
Now the proportion of women who only prefer exercise is calculated as:
Therefore we must search among the options the table that shows a proportion of 39 for women who prefer only the exercise.
This table is in option C.
C.
Diet Only Exercise Only Diet and Exercise
Men 0.24 0.61 0.60
Women 0.76 0.39 0.40
Answer:
And if we solve for we got
So then the mean is for this case.
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 variable of interest of a population, and for this case we know the distribution for X is given by:
For this part we want to find a value a, such that we satisfy this condition:
(a)
(b)
Both conditions are equivalent on this case. We can use the z score again in order to find the value a.
As we can see on the figure attached the z value that satisfy the condition with 0.25 of the area on the left and 0.85 of the area on the right it's z=-0.674. On this case P(Z<-0.674)=0.25 and P(z>-0.674)=0.85
If we use condition (b) from previous we have this:
But we know which value of z satisfy the previous equation so then we can do this:
And if we solve for we got
So then the mean is for this case.