Math Test Set 12 - My Career Tools

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1. Mia goes to East York Collegiate Institute. She is given the following information:

There are 150 grade 12 students at East York Collegiate Institute. 70 of the grade 12 students drive a car at the school. Half of all students with a grade average of 90 or higher have a car.

She is asked to find the probability of randomly choosing a grade 12 student with a car, given that the
student has an average grade of 90 or higher. She reasons initially that, since there are 70 grade 12 students out of 150 who have a car, it would be \(frac{7}{15}\). However, since it is a conditional probability, she needs to multiply by \(\frac{1}{2}\), since the probability that a student with a grade average of 90 or higher is \(frac{1}{2}\). This results in a probability of \(frac{7}{30}\). Is she correct or not, and why?

A.Yes, and her reasoning is correct.

B.No, she didn't need to multiply by \(\frac{1}{2}\) and the probability is \(\frac{7}{15}\). The probability that a student has a car can be assumed to be independent of their grade average, and so no multiplication is needed.

C.No, there is insufficient information to find this probability.

D.No, she needs to state that it can be assumed that half of grade 12 students have an average of 90 or higher. Therefore, half of 70 is 35, half of 150 is 75, and the probability is \(\frac{7}{15}\)

Question 1 of 10

Math-Evaluate expression

2. Simplify the given expression.

48 ÷ 4(6)

A.72

B.65

C.12

D.36

Question 2 of 10

3. Simplify the given expression.

\(-(-2)^{5}\)

A.32

B.-32

C.16

D.-16

Question 3 of 10

4. Evaluate the expression at the given value of x.

\(4x^{2} + 2x + 6\) at \(x = −6 \)

A.138

B.-138

C.75

D.-140

Question 4 of 10

Math-Exponents

5. Simplify the given exponential expression.

\((7s^{6n})^{3}\)

A.\(343s^{18n} \)

B.\(-343s^{18n} \)

C.\(s343^{18n} \)

D.\(343^{18ns} \)

Question 5 of 10

Math- Equations

6. Solve the equation.

8(5x − 3) − 3(4x + 6) = 4

A.\(\frac{23}{14}\)

B.\(\frac{1}{14}\)

C.\(\frac{22}{14}\)

D.\(\frac{14}{23}\)

Question 6 of 10

Math-Solution of equations

7. Use the elimination method to solve each of the following systems.

2x − 6y = 28
−3x + 18y = −60

A.(8,-2)

B.(-8,-2)

C.-(8,-2)

D.16

Question 7 of 10

Math-Word problems

8. The number −15 is −5 times larger than an unknown number. Find the unknown number.

A.3

B.-3

C.6

D.-6

Question 8 of 10

9. Eight more than two times an unknown number is 0. Find the unknown number.

A.-4

B.4

C.-2

D.2

Question 9 of 10

Math-Percent to decimal

10. Convert the given percent to a decimal.

0.83%

A.0.0083

B.83

C.0.83

D.0.083

Question 10 of 10