Triangle XYZ is rotated 90° counterclockwise about the origin.
2 answers:
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Answer:
The money each boy had after buying his ticket is <u>$2.50</u>.
Step-by-step explanation:
Given:
Miguel and three of his friends went to the movies. They originally had a total of $40. Each boy had the same amount of money and spent $7.50 on a ticket.
Now, to find the money each boy had after buying his ticket.
Let the money each boy had after buying his ticket be
Total number of boys = 4.
Total money they had = $40.
Money each boy spent = $7.50.
Now, to write an equation:
Now, to solve the equation for getting the money each boy had after buying his ticket:
<em>Subtracting both sides by 30 we get:</em>
<em>Dividing both sides by 4 we get:</em>
Therefore, the money each boy had after buying his ticket is $2.50.
Mean is and a standard deviation is
, then the variable
.
Use substitution
.
This substitution gives you that .
a. For X=130, and
(the decimal value is taken from the Standard Normal Distribution Table).
b. For X=90, and for X=110,
. Then
(the decimal value is taken from the Standard Normal Distribution Table).