Answer:
And we can find this probability using excel or the normal standard tabe and we got:
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 temperatures 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 using excel or the normal standard tabe and we got:
That's easy. Just look up the arc sine of .43 which equals:
25.468 Degrees
The answer is 6.
6+6=12
12+7=19
hope this helps
First, you need to take 40% off of the original price ($68) to find the discount. to do this, multiply 68 by 0.4 (.4 is 40% in decimal form). You should get $27. 20. Next, you subtract this from 68- keep in mind that we found the discount, not the actual price. 68- 27.20= 40.8. Now, we multiply this by 20%, or 0.2- you should get 8.16. Subtract that from 40.8 to get <u>$32.64</u>.
Answer:
3 / 5
Step-by-step explanation:
Numbers divisible by 4: {4, 8, 12, 16, 20}
Values 3 through 9: {3, 4, 5, 6, 7, 8, 9}
In probability "or" means addition (+)
Therefore:
Prob. (no divisible by 4 or value 3 through 9) =
5 / 20 + 7 / 20
= 5 + 7 / 20
= 12 / 20
= 3 / 5.