MAT302 MIDTERM Exam Study Guide

1440 Words May 10th, 2015 6 Pages
A variable is classified as ordinal if:

A.there is a natural ordering of categories

B.we track the variable through a period of time

C.there is no natural ordering of categories

D.the data arise from continuous measurements

If a die is rolled one time, find the probability of getting a number greater than 2.

A.2

B.-1

C.5/6

D.4/6

Sue has 10 pictures but only has space in her apartment to hang 4 of them on a wall. The number of different arrangements of four pictures from a selection of ten pictures is:

A.5,040

B.24

C.151,200

D.210

The failure rate for taking the bar exam in Philadelphia is 41%. If 375 people take the bar exam, what is the mean for the number of failures?

A.138.1
1
2
3
Yes
60
110
30
200
No
40
215
45
300 100
325
75

Given that multiple vehicles were involved, what proportion of accidents involved alcohol? Place your answer, rounded to 2 decimal places, in the blank. For example, 0.23 is a legitimate entry. 0.35

MotherMothers Against Drunk Driving (MADD) is a very visible group whose main focus is to educate the public about the harm caused by drunk drivers. A study was recently done that emphasized the problem we all face with drinking and driving. Five hundred accidents that occurred on a Saturday night were analyzed. Two items noted were the number of vehicles involved and whether alcohol played a role in the accident. The numbers are shown below: Number of Vehicles Involved
Did alcohol play a role?
1
2
3

Yes
60
110
30
200
No
40
215
45
300

100
325
75

Given that 3 vehicles were involved, what proportion of accidents involved alcohol? Place your answer, rounded to 2 decimal places, in the blank. For example. 0.23 is a legitimate entry. 0.40

ThThe mean weight of loads of coal placed in train cars by a loading machine is 43.0 tons with a standard deviation of 8.0 tons. Assuming that the weight of loads placed in the train cars by this loader are normally distributed, if a random sample of 9 loads is chosen for a weight check, find the probability