Probability 7th grade

Front

What is probability?

Back

Probability is a measure of how likely an event is to occur, expressed as a number between 0 and 1, where 0 means the event will not happen and 1 means it will certainly happen.

Front

What is an odd number?

Back

An odd number is an integer that is not divisible by 2, meaning it has a remainder of 1 when divided by 2.

Front

How do you calculate the probability of an event?

Back

Probability of an event = (Number of favorable outcomes) / (Total number of possible outcomes).

Front

What is the probability of selecting an odd number from the numbers 1-15?

Back

8/15, because there are 8 odd numbers (1, 3, 5, 7, 9, 11, 13, 15) out of 15 total numbers.

Front

What is a marble drawing experiment with replacement?

Back

In a drawing experiment with replacement, after drawing an item (like a marble), it is put back into the bag before the next draw, keeping the total number of items constant.

Front

What is the probability of drawing two yellow marbles from a bag with 3 green and 2 yellow marbles?

Back

4/25, calculated as (2/5) * (2/5) since the draws are independent with replacement.

Front

What is a prime number?

Back

A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.

Front

What is the probability of selecting a prime number and then a 1 from a set of cards?

Back

3/20, calculated by finding the probability of selecting a prime number first and then a 1 without replacement.

Front

What is the probability of rolling a five on one die and an even number on another?

Back

1/12, calculated as (1/6 for the five) * (1/2 for the even number).

Front

What is an even number?

Back

An even number is an integer that is divisible by 2, meaning it has no remainder when divided by 2.