Popular Questions - Mathematics – Probability

X is a random variable with f(x) = cxe~2x, for 0 < x < oo. Here c is some positive constant. 1. What is the value of c? 2. Find E[5X + 1]. 3. Find Var [AX + 2]. 4. Consider Y ~ Uni([l, 5]). What is...

Q4. [10] If E(XY) = 2- 0.8f and E(YX) = 3 – 0.2X, find the correlation coefficient between X and Y. If the p.d.f. of Xis 2, -1

Test Questions 1. In a survey of 1254 adults, it was found that 74% of them use some form of social media. a. From this survey, how many adults use some form of social media? Round to the nearest...

3. For an upcoming election in some county of South Carolina, we wish to determine the minimum sample size required in order to estimate the true percentage of registered Democratic voters. Using a...

Suppose 241 subjects are treated with a drug that is used to treat pain and 53 of them developed nausea. Use a 0.01 significance level to test the claim that more than 20?% of users develop nausea....