Which of the following describes a simple event?

a. spinning “back 2 spaces” on a spinner and drawing a blue or red marble from a box
b. spinning “back 2 spaces” on a spinner
c. rolling an odd number on a die and getting tails on the toss of a coin
d. tossing a coin 5 times and getting heads twice

Option B is correct.

Step-by-step explanation:

B- Spinning “back 2 spaces” on a spinner is a simple event. The probability that it will get 2 spaces back from where it started first is a single event.

A involves probability of landing 2 spaces back along with the probability of drawing a blue or red marble from a box. This is compound event.

C also involves 2 probabilities.The probability of getting an odd number on a die plus the probability of getting tails on the toss of a coin.  

D involves 5 probabilities with one probability for each toss.  

Therefore, option B is correct.

answer: for each 3 girls there is 2 boys . 3: 2

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step-by-step explanation: