Statistics - Discrete Random Variables- probablility

1.Thirty per cent of all patients undergoing a particular diagnostic procedure require a sedative. In a random sample of 10 patients undergoing the procedure, what is the probability that
a.at least half will require a sedative?
b.fewer then 3 will require a sedative?
c.at least 9 will not require a sedative?

2.The duration of human pregnancies from conception to birth is approximately normally distributed, with a mean of 265 days and a standard deviation of 15 days.
a.What is the probability that the duration of human pregnancy is less than or equal to 228 days?
b.What is the probability that the duration of a human pregnancy exceeds 300 days?
c.What is the probability that the duration of a human pregnancy lasts from 238 days to 299 days?
d.Twenty percent of human pregnancies last more than what amount of time?

3.An airline company knows that 8% of its passengers will not show up for their scheduled flights. A plane has 175 seats.
a.What is the probability that 10 passengers or fewer will not show up?
b.What is the probability that from 10 to 15 passengers will not show up?
c.What is the probability that exactly 10 passengers will not show up?
d.What is the probability that more than 19 passengers will not show up?

... withdraw without completing the introductory statistics course ... Examples of random variables would be: the sum of ... A discrete random variable is a random variable...

Probability and Statistics: Varibables and ... distribution: Continuous Random variables given instead ...Discrete random variable, probability mass functions and ...

Statistics Problem Set: Discrete Probability Distribution. 4.182: For each of the following examples, decide whether x is a binomial random variable and explain ...

Business Statistics: Probability Sample Questions. ... For a discrete random variable which can take values ... All continuous random variables are normally distributed ...

Practice Quiz - Statistics. ... _____19. The mean of the discrete probability distribution for a discrete random variable is called its expected value. ...

... continuous random variable, and describe why each is continuous or discrete. W1A4 Sample Questions Determine if this is an example of probability or statistics: ...

... Problems taken from Â“Fundamentals of Statistics, Fourth Edition ... 0.006=1 Hence, it is a discrete probability distribution (c ... the mean of the random variable X. E ...

Statistics. ... 11. If X = {2, 6, 10, 14} and P(2) = 0.2, P(6) = 0.3, P(10) = 0.4, and P(14) = 0.1, can distribution of the random variable X be ...discrete continuous. ...

...Statistics is really not that difficult ... x) provides the probability that the random variable x assumes ... That is, a discrete function that allows negative values ...