Focus On Life Science: California Grade 7

Chapter 4: Genetics

Math Practice

1.
Spin a spinner numbered 1 to 7, and toss a coin. What is the probability of getting an odd number on the spinner and a tail on the coin?
A)2 out of 7
B)1 out of 14
C)1 out of 7
D)1 out of 4
2.
A jar contains 6 red balls, 3 green balls, 5 white balls and 7 yellow balls. Two balls are chosen from the jar, with replacement. What is the probability that both balls chosen are green?
A)1 out of 49
B)1 out of 2401
C)1 out of 7
D)3 out of 7
3.
A jar contains 6 red balls, 3 green balls, 5 white balls and 7 yellow balls. What is the probability of choosing a red and a yellow ball?
A)1 out of 21
B)2 out of 7
C)2 out of 21
D)1 out of 7
4.
A jar contains 6 red balls, 3 green balls, 5 white balls and 7 yellow balls. What is the probability of choosing two red balls?
A)2 out of 3
B)2 out of 7
C)6 out of 21
D)4 out of 49
5.
A jar contains 6 red balls, 3 green balls, 5 white balls and 7 yellow balls. What is the probability of choosing a green and a white ball?
A)5 out of 147
B)5 out of 7
C)3 out of 7
D)5 out of 140
6.
Four cards are chosen from a standard deck of 52 playing cards with replacement. What is the probability of choosing 4 hearts in a row?
A)1 out of 28561
B)1 out of 13
C)1 out of 169
D)1 out of 2197
7.
What is the chance that a family with 6 children has them born in alternating sex order, with the oldest being a male?
A)1 out of 64
B)1 out of 6
C)1 out of 8
D)3 out of 32
8.
What is the chance that a family has 6 girls in a row?
A)1 out of 6
B)1 out of 64
C)1 out of 8
D)3 out of 32
9.
Given that the first three children are boys, what is the chance that the next child will be a girl?
A)1 out of 64
B)1 out of 2
C)1 out of 8
D)1 out of 16
10.
What is the probability of drawing 2 red cards randomly out of a standard deck of 52 cards?
A)1 out of 26
B)1 out of 2
C)1 out of 4
D)1 out of 13
Grade 7
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