A group of 225 student needs to be arranged in a square formation for a halftime performance show
2 answers:
Answer:
15 students should be lined up in each row.
Step-by-step explanation:
A group of 225 student needs to be arranged in a square formation.
This means same number of students will sit in each row as in each column.
To find this we will take the square root of 225.
There will be = students in each rows and columns.
Therefore, 15 students should be lined up in each row.
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Answer:
And we can find this probability with the complement rule:
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 average homicide rate for the cities 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 with the complement rule: