# PHC 4069-Which of the following is a valid probability distribution

Question 11 ptsWhich of the following is a valid probability distribution of adiscrete random variable?I:x0123p(x)0.120.380.260.24II:x13916p(x)-0.20.30.40.5a. only I isb. only II isc. both I and II ared. neither I or II isLet Z represent a standard normal random variable. P(Z>0)is equal toa. 0.0b.0.5c. 0.45d. 0.9A graduate student who takes 3 courses in one semester. IfX=the number of courses with grade "A". The randomvariable X has a probability distribution as followsx0123p(x)0.10.150.650.1The probability P(X < 2) is equal toa0.90b.0.25c. 0.15d. 0.65A dealer in the Sands Casino in Las Vegas selects 40 cardsfrom a standard deck of 52 cards. Let Y be the number of redcards (hearts or diamonds) in the 40 cards selected. Whichof the following best describes this setting?a Y has a binomial distribution with n = 40 observations and probability. of success p = 0.5.b. Y has a binomial distribution with n = 40 observations andprobability of success p =0.5, provided the deck is shuffled well.c. Y has a binomial distribution with n = 40 observations andprobability of success p =0.5, provided that after selecting a card it isreplaced in the deck and the deck is shuffled well before the next cardis selected.d. None of theseIn a standard normal distribution, the range of values of z isform-to0 to0 to 1-3.09 to 3.09Question 61 ptsA z-score tells youhow far above or below the mean a score lies.the original raw score on which it is based.if the distribution it comes from is normal.how far above or below the mean a score lies in standard deviationunitsQuestion 71 ptsThe normal curve represents a distribution where the__________, ___________, and ___________ are equal to eachother.Range, standard deviation and varianceMean, median and standard deviationMode, median and standard deviationMean, median and modeQuestion 81 ptsIf a distribution has a mean of 100 and a standard deviationof 15, what value would be +2 standard deviations from themean?7011513085Question 91 ptsA binomial experiment is a probability experiment thatsatisfies the following requirements:Trials have two mutually exclusive outcomes considered as eithersuccess or failure, and are independent each other.There must be a fixed number of trials.The probability of a success must remain the same for each trial.All of theseQuestion 101 ptsWhich one of these variables is a continuous randomvariable?The time it takes a randomly selected student to complete anexam.The number of tattoos a randomly selected person has.The number of women taller than 68 inches in a random sample of5 women.The number of correct guesses on a multiple choice test.

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