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- 1. Multiple ChoiceThe mean life of a tire is 30,000 km. The standard deviation is 2000 km.
Then, 68% of all tires will have a life between ___________ km and __________ km.28,000 km and 32,000 km.24,000 km and 34,000 km.26,000 km and 34,000 km.27,000 km and 31,000 km. - 2. Multiple ChoiceThe average waist size for teenage males is 29 inches with a standard deviation of 2 inches.
If waist sizes are normally distributed, determine the z-score of a teenage male with a 33 inch waist.21-2-1 - 3. Multiple ChoiceThe normal curve is symmetrical about the mean.TrueFalse
- 4. Multiple ChoiceWhat is the standard deviation for the data given:
5, 10, 7, 12, 0, 20, 15, 22, 8, 2
(Put each value into data and look at Sx)7.8310.17.269 - 5. Multiple ChoiceThe number of miles that Jenna cycled each week for a 7-week period is shown:
36, 42, 28, 52, 48, 36, 31
What is the median number of miles Jenna cycled?24363952 - 6. Multiple ChoiceThe mean temperature in Glens Falls for the month of February is 23 degrees with a standard deviation of 4.2 degrees. Approximately what percent of days in February will have days below 23 degrees?5%34%50%68%
- 7. Multiple ChoiceIf 10 is added to every value in a set of data, what will happen to the value of the mean?it will increase by 10it will decrease by 10it will stay the sameit will both increase and decrease
- 8. Multiple ChoiceIf 10 is added to every value in a set of data, what will happen to the value of the standard deviation?it will increaseit will decreaseit will stay the sameit will both increase and decrease
- 9. Multiple ChoiceWhat shape is a normal distribution curve?Half curveRound curveBell curveSquare curve
- 10. Multiple ChoiceIf the shaded area under the curve is .85, what is the other missing portion of the curve?.26.15.30.17
- 11. Multiple ChoiceThe shelf life of a particular dairy product is normally distributed with a mean of 12 days and a standard deviation of 3 days.
About what percent of the products last between 12 and 15 days?68%34%16%2.5% - 12. Multiple ChoiceThe Floppy Disk Company makes 3.5 inch floppy disks for disk drives that are 3.7 inches wide. The size of a manufactures disk is normally distributed with a standard deviation of 0.1 inches. The company manufactures 1000 disks every hour.
In one hour, how many disks would you expect to be between 3.4 inches and 3.7 inches?819 disks23 disks500 disks0 disks - 13. Multiple ChoiceThe number of pages that Carolyn wrote in her journal each day from Monday to Friday is shown below:
9, 8, 12, 6, 10
What is the mean number of pages she wrote per day?56911 - 14. Multiple ChoiceWomen’s heights have a mean of 63.6 in. and a standard deviation of 2.5 inches. The z score corresponding to a woman with a height is 2.56. How tall is the woman?24.42 in70 in28in68.6in
- 15. Multiple ChoiceThe average waist size for teenage males is 29 inches with a standard deviation of 1.4 inch.
If waist sizes are normally distributed, estimate the proportion of teenagers who will have waist sizes greater than 31 inches?92.4%10.5%16%7.6% - 16. Multiple ChoiceThe scoring of modern IQ is such that Intelligence Quotients (IQs) have a normal distribution of μ= 100 and 𝞂 = 15.
Mensa International is a non-profit organization that accepts only people with IQ score within the top 2%. What level of IQ qualifies one to be a member of Mensa?115130.75145120 - Answer choicesTagsAnswer choicesTags