Question
number 7
pts) A commuter must pass through five traffic lights on her way to work, and she will have to stop at each one that is red. Let X- the number of red lights she stops at on her way to work. She estimates the distribution for X to be as shown below Value of x Probability 0.10.30 2 0.2 0.15 10.05 a. b. c. Fill in the blank in the distribution table. What is the proportion of times when she has to stop at least 3 times? On average, how many traffic lights does she stop at on her way to work? 7. Tell if the statements regarding a Normal density curve is true or false.(6 total, 2each) a. b. c- It is symmetric. It has a peak centered above its mean. The quartiles lie l standard deviation below and above the mean. 8. (2pts) Resistances of a type of resistor are normally distributed with mean -10 ohms an What fraction of resistors has resistance above 10 standard deviation ohms? 0.08 ohms. 9. For a continuous Uniform random variable x defined on the interval (0,2) its density o- is in the figure below (6pts):
Explanation / Answer
7)a) True
B) True
C) False
