Answer:
1/4 = 3/12 = 1/12+1/12+1/12
Step-by-step explanation:
Because 1/4 equals 3/12.
Answer:
1. $13.5 ($13.50)
2. $70.96
3. $9.75
4. 25%
Step-by-step explanation:
1. 30% of 45 = 13.5
2. 7.5% of 66 = 4.95,
4.95 + 66 = 70.96
3. 39 - 29.25 = 9.75
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:
X is 6*10=60 and therefore y will be 14*10 which gives us 140. So y=140