SImple Probability

Front

What is experimental probability?

Back

Experimental probability is the ratio of the number of times an event occurs to the total number of trials or experiments conducted.

Front

How do you calculate experimental probability?

Back

Experimental probability = (Number of successful outcomes) / (Total number of trials)

Front

If a spinner has 5 equal sections, what is the probability of landing on any one section?

Back

1/5 or 20%.

Front

What is the probability of landing on a number greater than 2 on a spinner with numbers 1 to 5?

Back

The probability is 3/5 or 60%.

Front

If you spin a spinner 100 times and land on a 3, 20 times, what is the experimental probability of landing on 3?

Back

The experimental probability is 20/100 = 1/5 or 20%.

Front

What is the probability of pulling a green marble from a bag containing 8 green, 2 red, and 10 blue marbles?

Back

The probability is 8/(8+2+10) = 8/20 = 2/5 or 40%.

Front

If you spin a spinner with 4 colors (red, blue, green, yellow) and red appears 10 times out of 40 spins, what is the experimental probability of spinning red?

Back

The experimental probability is 10/40 = 1/4 or 25%.

Front

What is the probability of spinning either red or yellow on a spinner with 4 colors (red, blue, green, yellow)?

Back

If red and yellow each appear once, the probability is 2/4 = 1/2 or 50%.

Front

If a spinner is spun 60 times and lands on 3 a total of 15 times, how many times should you expect it to land on 3 if spun 90 times?

Back

You would expect it to land on 3 about 22.5 times, but since you can't land on a fraction, you would expect 22 or 23 times.

Front

What is the total probability of landing on a number less than 4 on a spinner with numbers 1 to 6?

Back

The probability is 3/6 = 1/2 or 50%.