7th grade Statistics and Probability

In the past month, Alex was late to work twice. If there were 21 days of work last month, what is the experimental probability that he will be late to work tomorrow?

• 19/2

• 21/2

• 2/19

• 2/21

Erin like to make microwave popcorn. Out of the last twenty times she made popcorn, she burned it eleven times. Based on the information, what is the experimental probability that she will NOT burn it next time?

• 9/20

• 20/9

• 11/20

• 20/11

• 9/50

• 25/4

• 4/21

• 4/25

• 0.5

• 0.25

• 0.625

• 0.75

• not be uniform because the probability of rolling each number is different

• be uniform because the probability of rolling each number is different

• not be uniform because the probability of rolling each number is the same

• be uniform because the probability of rolling each number is the same

• Yes, because the probability of rolling an odd number is 1/2, and the probability of rolling an even number is 1/2

• Yes, because the probability of rolling an odd number is 1/10, and the probability of rolling an even number is 1/10

• No, because the probability of rolling an odd number is greater than the probability of rolling an even number

• No, because the probability of rolling an even number is greater than the probability of rolling an odd number

A bag contains letter tiles. The following tiles are in the bag: E, A, E, T, N, G, P, T, and E. Assume you will randomly draw out letters from the bag, without looking, and then replace the letter into the bag.

What is the sample space of this event?

• {A, E, G, N, P, T}

• {A, E, T}

• {E, T}

• {N, G, E}

What would be the expected probability of getting this multiple choice question correct?

• 1/4
• 2/4
• 1/5
• 10%

Each of the 20 students in Mr. Anderson's class flipped a coin ten times and recorded how many times it came out heads.  Use this data to estimate the probability of observing 4, 5, or 6 heads in ten tosses of the coin.

• 4/20
• 5/20
• 12/20
• 3/20

• 1/2

• 1/3

• 2/3

• 2/1