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Started on Wednesday, 26 July 2023, 6:25 PM
State Finished
Completed on Wednesday, 26 July 2023, 6:31 PM
Time taken 6 mins 32 secs
Marks 20.00/20.00
Grade 100.00 out of 100.00
Question 1
Which one of the following statements is incorrect with regard to the normal probability distribution?
Correct
Mark 2.00 out of
2.00
a. The standard normal distribution has a mean of 0 and standard deviation of 1.
b. The area to right of mean of a standard normal distribution is 0.5 and the area left of the
mean of a standard normal distribution is also 0.5.
c. The z-score of the mean of a normal probability distribution is one.
d. 99.7% of the values of a normal random variable are within ±3 standard deviation of the
mean.
e. The smaller the value of the standard deviation, the narrow and steeper the curve.
Started on Wednesday, 26 July 2023, 6:38 PM
State Finished
Completed on Wednesday, 26 July 2023, 6:49 PM
Time taken 11 mins 32 secs
Marks 20.00/20.00
Grade 100.00 out of 100.00
Question 1
Which one of the following statements is incorrect with regard to the normal probability distribution?
Correct
Mark 2.00 out of
2.00
a. The standard normal distribution has a mean of 0 and a standard deviation of 1.
b. The area to right of mean of a standard normal distribution is 1 and the area left of the
mean of a standard normal distribution is also 1.
c. The z -score of the mean of a normal probability distribution is 0.
d. 95.4% of the values of a normal random variable are within ±2 standard deviation of the
mean.
e. The smaller the value of the standard deviation, the narrow and steeper the curve.
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