Test1

Question No.1 – Encircle the most suitable answer.

1.       A large basket of fruit contains 3 oranges, 2 apples, and 5bananas. If a piece of fruit is chosen at random, what is the probability of getting an orange or a banana? 

A.    4/5 B. ½                        C.  7/10 D. None of the above

2.       A pair of dice is rolled. What is the probability of getting a sum of 2?
A. 1/6                    B. 1/3                    C. 1/36                  D. None of the above

3.       In a class of 30 students, there are 17 girls and 13 boys. A total of 5 students made an A grade on their report card, three of which were girls. If a student is chosen at random, what is the probability of getting a girl or an A student? 
A. 19/30               B. 11/15                C. 17/180             D. None of the above

4.       Which of the following are mutually exclusive events when a day of the week is chosen at random?
A. Choosing a Monday or choosing a Wednesday              B. Choosing a Saturday or choosing a Sunday      C. Choosing a weekday or choosing a weekend day D. All of the above

5.       A day of the week is chosen at random. What is the probability of choosing a Monday or Tuesday?
A. 1/7                                    B. 2/14                                  C. 2/7                                    D. None of the above

6.       A jar contains 6 red balls, 3 green balls, 5 white balls, and7 yellow balls. , what is the probability of getting a red and a yellow ball?

A.    2/21                               B.3/21                   C.13/63                                 D.            All of the above

7.       On a math test, 5 out of 20 students got an A. If three students are chosen at random without replacement, what is the probability that all three got an A on the test?
A. 1/114                               B.25/1368                            C.3/400                 D. None of the above

8.       Which of the following is an outcome? 
A. Rolling a pair of dice                                                 B. Landing on red                     

C. Choosing 2 marbles from a jar                                   D. None of the above

9.       The normal curve is also called a

A.            bell-shaped curve e     B. Triangular curve       C. even curve D.      s-curve

10.  If a distribution has a mean of 100 and a standard deviation of 15, what value would be +2 standard deviations from the mean?

A. 70                      B.115                     C.130                                     D. 85

Q. No 2 - A test has been devised to measure a student's level of motivation during high school. The motivation scores on this test are approximately normally distributed with a mean of 25 and a standard deviation of 6.

1) What percentage of students taking this test will have scores greater than 10? 

2) John is told that 35% of the students taking the test have higher motivation scores than he does? What was John's score?