Normal Distributions

Front

Back

0.34

Front

On the math portion of the SAT, scores are roughly normal, with a mean of 500 and a standard deviation of 100. What percent of scores are above 400?

Back

15.9%

Front

Mean number of accidents a week: 6.4, Standard deviation: 1.5. What proportion of weeks have more than 7 accidents?

Back

0.3446

Front

A grading scale is set up for 1000 students' test scores. It is assumed the scores are normally distributed with a mean score of 75 and a standard deviation of 15. How many students will have a score between 45 and 75?

Back

475

Front

What shape is a normal distribution curve?

Back

Bell curve

Front

Given a mean of 75 and a standard deviation of 7, how many students out of 500 would score higher than 68?

Back

420

Front

What's the probability x < 13? (Mean = 10, Variance = 4)

Back

0.9332

Front

What is the area under the curve to the left of z = 0.55?

Back

.7088

Front

What is the area under the curve between z = 0 and z = 1.45?

Back

.4265

Front

What percentage of customers will spend less than $3.00 on concessions if the spending distribution is approximately normally distributed with a mean of $4.11 and a variance of $²4?

Back

0.288