24.25: Statistics & Probability Midterm: Pre-Test

Front

What is the probability of selecting one senior and one junior from a class of 10 seniors and 8 juniors when choosing 2 students?

Back

0.5229

Front

By definition, independent events _________________________ .

Back

are not affected by each other

Front

What is the z-score for a test completion time of 68 minutes, given a mean of 45 minutes and a standard deviation of 12 minutes?

Back

-3.08

Front

How many different suits can be made with 3 jackets, 6 shirts, 8 ties, and 4 pairs of pants?

Back

576 different suits

Front

What is the probability that a randomly selected month has 31 days or starts with the letter J?

Back

2/3

Front

Define 'independent events' in probability.

Back

Events that do not influence each other's outcomes.

Front

What is the formula for calculating the probability of an event?

Back

P(E) = Number of favorable outcomes / Total number of outcomes

Front

What does a z-score represent in statistics?

Back

The number of standard deviations a data point is from the mean.

Front

How do you calculate the total number of combinations of items?

Back

Use the formula nCr = n! / (r!(n-r)!) where n is the total items and r is the items chosen.

Front

What is the mean in a normal distribution?

Back

The average value of a set of data points.