1-What is the probability of rolling a die and getting either a 1 or a 6? a. 1/3

Question

1-What is the probability of rolling a die and getting either a 1 or a 6?

     a. 1/3

     b. 1/2

    c. 6/21

    d. 8/2

The grades on a math midterm are normally distributed with =68 and

= 5.5. If a student scored 66 on the exam, the z-score of his exam grade rounded to two decimal places is

A. 0.43

B. 2.32

C. 0.36

D. – 0.43

3-Express the confidence interval -0.001< p < 0.559 in the form .

A - 0.279 - 0.28

b. 0.279+- 0.5

c. 0.279 +- 0.28

D. 0.28 +- 0.5

4-

A confidence interval is a range of values used to estimate the true value  

        of a

A- population

B- population parameter

c.   confidence coefficient

d.   sample size

Explanation / Answer

1)probability of rolling a die and getting either a 1 or a 6 =2/6 =1/3 option a

2)zscore =(66-68)/5.5=-0.36

3)here mid point =(0.559-0.001)/2 =0.279

and margin of error =(0.559+0.001)/2 =0.28

c. 0.279 +- 0.28

4)B- population parameter

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