Answer:
9/4
Step-by-step explanation:
(-3/2)^2=9/4
Answer:
115.3333
Step-by-step explanation:
346/3
Hope this helps. :)
Answer:
x = -(8/5) or -(
)
Step-by-step explanation:
-5x+12=20
-5x=20-12
-5x=8
x = -(8/5) or -(
)
2
Because -
2 x 12=12
2 x 13 = 36
2 x 42 = 84
Answer:
And we can find this probability on this way:
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 problm
Let X the random variable that represent the scores on an exam 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 on this way: