
ch 15 Random Variables
Authored by Amy Delehant
Mathematics
10th Grade - University
CCSS covered
Used 28+ times

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8 questions
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1.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Which of the following random variables is NOT continuous?
2.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
A random variable X has a mean of 5 and a st. dev of 0.40. A random variable Y has a mean of 8 and a st. dev of 0.60. If both are independent, what is the mean of X + Y?
13
6.5
14
Not here.
Tags
CCSS.HSS.MD.A.3
CCSS.HSS.MD.A.2
3.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
A random variable X has a mean of 5 and a st. dev of 0.40. A random variable Y has a mean of 8 and a st. dev of 0.60. If both are independent, what is the st. dev of X - Y?
Tags
CCSS.HSS.CP.A.2
4.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
What is the expected number of orders per week?
Tags
CCSS.HSS.MD.A.3
CCSS.HSS.MD.A.2
5.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
A marketing survey compiled data on the number of cars in households. If X = the number of cars
What is the probability that a randomly chosen household has at least two cars?
0.20
0.29
0.39
0.61
Tags
CCSS.HSS.MD.A.3
CCSS.HSS.CP.B.9
6.
MULTIPLE CHOICE QUESTION
3 mins • 5 pts
The weight of written reports produced in a certain department has a Normal distribution with mean 60 g and standard deviation 12 g. The probability that the next report will weigh less than 45 g is
Tags
CCSS.HSS.MD.A.3
CCSS.HSS.ID.A.4
7.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
State whether it is Discrete or Continuous;
The speed of a car
Discrete
Continuous
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