REVIEW UNIT 8 PROBABILITY AND STATISTICS

Sue paid $25,000 for her car and kept a record of its value.

Assuming the pattern continues, which equation best models the curve of best fit for the data?

• y = 25213(0.863)^x

• y= 22000(0.862)^x

• y= 16000(0.138)^x

• y=12000(1.7)^x

Given the data in the table, what type of function would best represent the data?

What is the equation for the curve of best fit?

How many Americans will be over 100 in 2025?

• 499 Americans

• 262 Americans

• $y=34.9457(1.08389)^x$

• $y=0.4018x^2-1.175x+48.3429$

How many different combinations of sandwich, side, and beverage are possible for lunch?

Find the number of possibilities.

The batting order for nine players on a 10 person team.

Then find the number of possibilities.

Charlotte has homework assignments in six subjects. She only has time to do four of them.

A normally distributed data set has µ=25 and σ=2.5.

What would be the value of an element of this data set with z-score = -2?

Scores for a civil service exam are normally distributed. Approximately what percentage of the scores, rounded to the nearest whole number, are within three standard deviations of the mean?

• 98.7%

• 99.7%

• 89.8%

• 79.8%

The height of a population is normally distributed with a mean height = 67” and a standard deviation = 3.3”. What percent of the population is under 70”?

• 85.38%

• 82.85%

• 83.81%

• 81.83%

Check all that apply.

An incoming freshman took her college's placement exams in French and mathematics. In French, she scored 82 and in math 86. The overall results on the French exam had a mean of 72 and a standard deviation of 8, while the mean math score was 68, with a standard deviation of 12. On which exam did she do better compared with the other freshmen?

Find the z-score for each.

On which exam did she do better compared with the other freshmen?

• 1.25

• 1.4

• 1.5

• French

• Math

The weights of miniature horses are roughly normally distributed with a mean of 230 pounds and standard deviation of 45 pounds.

What percent of miniature horses weigh less than 140 pounds?

• 2.5%

• 2.75%

• 2%

• 1.5%