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? Need a Hint? 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? Need a Hint? 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? Need a Hint? 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? Need a Hint? 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? Need a Hint? 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? Need a Hint? 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? Need a Hint? 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? Need a Hint? 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? Need a Hint? 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? Need a Hint? A) 1 out of 26 B) 1 out of 2 C) 1 out of 4 D) 1 out of 13
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