Complete the mcq:
Q1)Which choice is another term that can be used to describe a normal distribution:
A) discrete distribution
B) negatively or positively skewed
C) bell curve
D) independent variable
Q2) If a normal distribution has a mean of 30 and a standard deviation of 5, then
A) the median is 35 and the mode is 25.
B) the median is 30 and the mode is 30.
C) the median is 30 and the mode is 35.
D) the median is 25 and the mode is 35.
Q3) Find the probability P(z < 0.37) using the standard normal distribution.
A) 0.6443
B) 0.6300
C) 0.1443
D) 0.3557
Q4) Find the area under the standard normal distribution curve between z = -2.05 and z = 2.05.
A) 0.9876
B) 0.4938
C) 0.4798
D) 0.9596
Q5) Find the probability P(-0.72 < z < -0.11) using the standard normal distribution
A) 0.7796
B) 0.2204
C) 0.0900
D) 0.3504
Q6) In a standard normal distribution, what z value corresponds to 17% of the data between the mean and the z value?
A) 0.52
B) 2.10
C) 0.44
D) 1.25
Q7)Find the z value to the right of the mean such that 85% of the total area under the standard normal distribution curve lies to the left of it?
Q8) If a normally distributed group of test scores have a mean of 70 and a standard deviation of 12, find the percentage of scores that will fall below 50.
A) 45.25%
B) 6.75%
C) 35.54%
D) 4.75%
Q9) The average hourly wage of workers at a car wash is $6.50/hr. Assume the wages are normally distributed with a standard deviation of $0.45. If a worker at this car wash is selected at random, what is the probability that the worker earns more than $6.75
A) 27.6%
B) 5.2%
C) 28.8%
D) 42.1%