Practice questions available in McGraw Hill Math Grade 6 Answer Key PDF Lesson 25.6 Calculating Probabilities will engage students and is a great way of informal assessment.
McGraw-Hill Math Grade 6 Answer Key Lesson 25.6 Calculating Probabilities
Exercises
CALCULATE
Question 1.
If there are 20 boys in your class of 35 students, what is the probability that your teacher will call on a girl student?
Answer:
Total number of students = 35
Number of boys = 20
Number of girls = 35 – 20 = 15
P(G) = 15/35 = 3/7
Thus the probability that your teacher will call on a girl student is 3/7
Question 2.
There are 12 green apples in the bag of 40 apples. What is the probability that you will get a green apple when you reach into the bag?
Answer:
Total number of apples = 40
Number of green apples = 12
P(G) = 12/40 = 3/10
Thus the probability that you will get a green apple when you reach into the bag is 3/10.
Question 3.
You decide to watch a movie. There are 3 scary movies in a stack of 12 DVDs. What is the probability that you will pick a scary movie?
Answer:
Given,
You decide to watch a movie. There are 3 scary movies in a stack of 12 DVDs.
Total number of DVDs = 12
Number of scary movies = 3
P(S) = 3/12 = 1/4
Thus the probability that you will pick a scary movie is 1/4
Question 4.
John knows that once a week his mother makes steamed spinach. What is the probability that when John has dinner tonight that he will not have spinach?
Answer:
John knows that once a week his mother makes steamed spinach.
Number of days in a week = 7
John knows that once a week his mother makes steamed spinach.
Number of days that will not have spinach = 6
The probability that when John has dinner tonight that he will not have spinach = 6/7
Question 5.
The department of motor vehicles noted that among passenger vehicles, there are 6 SUVs registered for every 12 cars registered in the state. What is the probability that the first vehicle you see on the street will be an SUV?
Answer:
Given,
The department of motor vehicles noted that among passenger vehicles, there are 6 SUVs registered for every 12 cars registered in the state.
The probability that the first vehicle you see on the street will be an SUV = 6/12 = 1/2
Question 6.
In any given crowd of 20 people, 17 will be carrying cell phones, and 3 of those cell phones will have low batteries. What is the probability that when you ask a random person to borrow a cell phone, you will get one with a low battery?
Answer:
Total number of people = 20
Number of people carrying cell phones = 17
Number of people who have low battery cell phones = 3
The probability that when you ask a random person to borrow a cell phone, you will get one with a low battery = 3/20
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