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math
During the first year at a university that uses a fourpoint grading system, a freshman took ten threecredit courses and received two As, three Bs, four Cs, and one D. a) Compute this student's g.p.a. What I did : 2+3+4+1/4=2.5
asked by lijm on November 1, 2019 
Elementary statistics
Nine apples, four of which are rotten, are in a refrigerator. Three apples are randomly selected without replacement. Let the random variable x represent the number chosen that are rotten. Construct a table describing the
asked by Rose Bud on February 29, 2012 
StatsProbability
Would really urgently appreciate answers to these questions. Thanks. 3. Suppose that two lotteries each have n possible numbers and the same payoff. In terms of expected gain, is it better to buy two tickets from one of the
asked by Johnny on July 13, 2006 
Probability
The joint PMF, pX,Y(x,y), of the random variables X and Y is given by the following table: (see: the science of uncertainty) 1. Find the value of the constant c. c = 0.03571428571428571428 2. Find pX(1). pX(1)= 1/2 3. Consider the
asked by RVE on February 25, 2015 
math
Five males with a particular genetic disorder have one child each. The random variable x is the number of children among the five who inherit the genetic disorder. Determine whether the table describes a probability distribution.
asked by Mary on July 23, 2019

probability
A fair coin is flipped independently until the first Heads is observed. Let K be the number of Tails observed before the first Heads (note that K is a random variable). For k=0,1,2,…,K, let Xk be a continuous random variable
asked by JuanPro on March 28, 2014 
probability
Determine whether each of the following statement is true (i.e., always true) or false (i.e., not always true). 1. Let X be a random variable that takes values between 0 and c only, for some c≥0, so that P(0≤X≤c)=1. Then,
asked by RVE on February 28, 2015 
probability
1) Let X and Y be independent continuous random variables that are uniformly distributed on (0,1) . Let H=(X+2)Y . Find the probability P(lnH≥z) where z is a given number that satisfies e^z
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math
I only need someone to check my answers. Find the expected value of a random variable X having the following probability distribution: x 15 1 0 1 5 8 p (x=x) .12 .16 .28 .22 .12 .10 E(X) = (5) * (.12) + (1) *(.16) + (0) *
asked by lijm on November 1, 2019 
stats
Consider an infinite population with 25% of the elements having the value 1, 25% the value 2, 25% the value 3, and 25% the value 4. If X is the value of a randomly selected item, then X is a discrete random variable whose possible
asked by Mischa on November 5, 2008