(1 point) Decide whether each statement is true or false. ? 1. A random variable

Question

(1 point) Decide whether each statement is true or false. ? 1. A random variable X is normally distributed with a mean of 150 and a variance of 36, Given that X = 120, its corresponding z-score is 5.0 A 2. The mean and standard deviation of an exponential random variable are equal to each ? other. 3. Let Z1 be a z-score that is unknown but identifiable by position and area. If the symmetrical area between -zi and +z1 is 0.9544, the value of zi is 2.0 4. Using the standard normal curve, the z-score representing the 75th percentile is 0.67.

Explanation / Answer

a) Z score = (120-150)/36 = -0.83. So, it is False

b) It is True.

c) Yes it is True. Excel function NORMSINV(0.9544+(1-0.9544)/2) = 2.0

D) Use Excel function

NORMSINV(0.75)

= 0.67

So, It is True

Related Questions

Navigate

• Browse (All)
• Browse #
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.