Statistics and Probability Answers

Waiting times at a doctor office are normally distributed with a mean of 35 minutes,
and a standard deviation of 10 minutes. What is the chance a patient would have to
wait over 50 minutes?

there are 17 customers who have entered the drawing. 4 live in the town of Gaston, 7 live in Pike, and 6 live in Wells. In the drawing the first customer will be selected random, and then the second customer will be selected at random from the remaining customers. what is the probability that both customers selected are wells residents?

what is the mean for 272 9292 8282 2828 827 929 92

Lotto. A previous Arizona State lottery, called lotto, was played as follows: The player selects six numbers from the numbers 1-42 and buys a ticket for $1. There are six winning numbers, which are selected at random from the numbers 1-42. To win a prize, a lotto ticket must contain three or more of the winning numbers. A ticket with exactly three winning numbers is paid $2. The prize for a ticket with exactly four, five or six winning numbers depends on sales and on how many other tickets were sold that have exactly four, five or six winning numbers, respectively. If you buy one Lotto ticket, determine the probability that
a.) you win the jackpot; that is , your six numbers are the same as the six winning numbers.
b.) your ticket contains exactly four winning numbers.
c.) you don't win a prize.

A statistics professor plans classes so carefully that the lengths of her classes are uniformly distributed between 46.0 and 56.0 minutes. Find the probability that a given class period runs between 50.5 and 50.75 minutes.

Find the probability of selecting a class that runs between
50.5
and
50.75
minutes.

The box contains 14 green and 19 black pencils. pencils are picked up randomly one by one without replacement. what is the probability that 2 black and 3 green pencils are picked up in first four pick ups ?

If Z is a standard normal variable, find the probability.
P(Z > 0.59)

A certain bond fund over the last 12 years has had a mean yearly return of 5.9% with a standard deviation of 1.8%.
A. If you had invested in this fund over the past 12 years, in how many of these years would you expect to have learned at least 8% on your investment?
B. In how many years would you expect to have earned less than 4%?

Assume that final grades in your math class have a mean of 72 and a standard deviation of 8. If the bottom 15% of class will be given an F, what is the cutoff for an F?

In a power lifting competition the distribution of total weight lifted has a mean of 1,100 pounds with a standard deviation of 20 pounds. what is the cutoff of total weight lifted for a competitor to finish in the bottom 30% of the competition?