Practice the questions of McGraw Hill Math Grade 8 Answer Key PDF Lesson 24.6 Calculating Probabilities to secure good marks & knowledge in the exams.
McGraw-Hill Math Grade 8 Answer Key Lesson 24.6 Calculating Probabilities
Exercises
INTERPRET
Question 1.
If you place 14 marbles in a bag with 7 red, 4 orange, and 3 black, what is the probability of blindly pulling a red marble from the bag?
Answer:
Probability of blindly pulling a red marble from the bag = 0.5.
Explanation:
Total number of marbles in a bag = 14.
Number of red marbles = 7.
Number of orange marbles = 4.
Number of black marbles = 3.
Probability of blindly pulling a red marble from the bag = Number of red marbles ÷ Total number of marbles in a bag
= 7 ÷ 14
= 1 ÷ 2
= 0.5.
Question 2.
If there are 20 males and 15 females in your class, and the teacher wants to appoint one person to be in charge of attendance, what is the probability that this person will be a female?
Answer:
Probability that this person will be a female = 0.42.
Explanation:
Number of males in the class = 20.
Number of females in the class = 15.
Total number of students in the class = Number of males in the class + Number of females in the class
= 20 + 15
= 35.
Probability that this person will be a female = Number of females in the class ÷ Total number of students in the class
= 15 ÷ 35
= 3 ÷ 7
= 0.42.
Question 3.
A survey was taken at school and all 525 students were asked if they belonged to a club. 212 people responded that they did belong to a club. What is the probability that if you randomly chose a person walking down the hall, that this person would belong to a club?
Answer:
Probability that randomly chosen a person walking down the hall, that this person would belong to a club = 2.47.
Explanation:
Total number of students were asked if they belonged to a club in the school = 525.
Number of students responded that they did belong to a club = 212.
Probability that randomly chosen a person walking down the hall, that this person would belong to a club = Number of students responded that they did belong to a club ÷ Total number of students were asked if they belonged to a club in the school
= 525 ÷ 212
= 2.47.
Question 4.
Someone mistakenly put three boxes of hardboiled eggs in with the regular farm eggs that totaled 156 boxes. What is the probability that someone buying a box of eggs will get a box of hardboiled eggs?
Answer:
Probability that someone buying a box of eggs will get a box of hardboiled eggs = 52.
Explanation:
Total number of boxes of eggs = 156.
Number of boxes of hardboiled eggs mixed mistakenly with boxes of regular farm eggs = 3.
Probability that someone buying a box of eggs will get a box of hardboiled eggs = Number of boxes of hardboiled eggs mixed mistakenly with boxes of regular farm eggs ÷ Total number of boxes of eggs
= 3 ÷ 156
= 52.