Q.6 A normal distribution ……………

(A) is a discrete probability distribution.

(B) can be either discrete or continuous.

(C) is a continuous probability distribution.

(D) always has a standard deviation of 1.

Q.7 Which of the following statements about the standard normal distribution is always true?

(A) If a z-score is negative, then the area to the left of the z-score is negative.

(B) If b is less than c, then the area to the left of b is less than the area to the left of c.

(C) If the area to the right of a z-score is positive, then the z-score is positive.

(D) None of the above

Q.8 The point of inflection of normal probability curve is

Q.9 The z value for a 97.8% confidence interval estimation is………….

Use the normal distribution table on your textbook or the Excel function \"NORM.S.INV\" to solve this problem

(A) 2.02

(B) 1.96

(C) 2

(D) 2.29

Q.10 The average IQ of secondary mathematics teachers is normally distributed with a mean of 122 and a standard deviation of 9.

Which definite integral represents the probability that a given secondary mathematics teacher has an IQ less than 100? Please explain why?

() + , - () - , + (C) , (D) -, @