Stats Multiple Choice Questions

Question 1
1. Let X be a random variable with the standard normal distribution. Find: P(-1.56 X <-0.81). /

 
 0.1496
 
 0.7910
 
 0.9406
 
 0.7316
 
 None of the above
 
 
Question 2
1. Diastolic blood pressure measurements of 100 adult males is distributed as X ~ N(m = 84,s 2 = 36) .How many males are at risk of high blood pressure (blood pressure above 90)?
 
 0.1587
 
 16
 
 15.8660
 
 12

Question 3
1. Let X be a random variable with the standard normal distribution.Find: P(X > 1.23).
 
 0.8907
 
 0.1093
 
 0.9032
 
 0.8849
 
 None of the above

Question 4
1. For some positive value of Z, the probability that a standard normal variable is between 0 and Z is 0.3340. The value of Z is:
 
 0.07
 
 0.37
 
 0.97
 
 1.06

Question 5
1. For some value of Z, the probability that a standard normal variable is below Z is 0.2090. The value of Z is:
 
 - 0.81
 
 - 0.31
 
 0.31
 
 1.96

Question 6
1. Let X be a random variable with the standard normal distribution.Find: P(X <- 2.57). .
 
 0.9938
 
 0.9965
 
 0.0051
 
 0.9949
 
 None of the above
 
Question 7
1. Find the area under the standard normal curve for z = 0.07.
 
 0.5
 
 0.7580
 
 0.5279
 
 0.5398
 
 0.512
 
 

Question 8
1. Find the area under the standard normal curve for z = 2.36.
 
 0.9918
 
 0.9987
 
 0.9911
 
 0.9909
 
 None of the preceding

Question 9
1. For some positive value of X, the probability that a standard normal variable is between 0 and +2X is 0.1255. The value of X is:
 
 0.99
 
 0.40
 
 0.32
 
 0.16

Question 10
1. For some positive value of Z, the probability that a standard normal variable is between 0 and Z is 0.3770. The value of Z is:
 
 0.18
 
 0.81
 
 1.16
 
 1.47