Questions from Statistics Principles

Q: Data suggests that the normal distribution with mean 13.0 and

Data suggests that the normal distribution with mean 13.0 and standard deviation 2.4 is a plausible model for the length (feet) of adult anaconda snakes. Find (a) P[X < 10.4 ] (b) P [ X ≤ 17.8 ] (c)...

Q: Referring to Exercise 6.25, find b such that

Referring to Exercise 6.25, find b such that (a) P[ X < b] = .7995 (b) P [ X > b ] = .002 (c) P[X < b ] = .015 Data from Exercise 6.25: Data suggests that the normal distribution with mean 13.0 an...

Q: Scores on a certain nationwide college entrance examination follow a normal distribution

Scores on a certain nationwide college entrance examination follow a normal distribution with a mean of 500 and a standard deviation of 100. Find the probability that a student will score: (a) Over 6...

Q: It is reasonable to model the distribution that produced the College Qualification

It is reasonable to model the distribution that produced the College Qualification Test (CQT) data as a normal distribution with mean 150 and standard deviation 25.4. (a) What is the probability of a...

Q: According to the children's growth chart that doctors use as a reference

According to the children's growth chart that doctors use as a reference, the heights of two-year old boys are nearly normally distributed with a mean of 34.5 inches and a standard deviation of 1.4 in...

Q: For the curve f(x) graphed in Exercise 6.

For the curve f(x) graphed in Exercise 6.1(c), which of the two intervals [ 0 < X < .5] or [ 1.5 < X < 2] is assigned a higher probability?

Q: Let the random variable X represent the sum of the points in

Let the random variable X represent the sum of the points in two tosses of a die. (a) List the possible values of X. (b) For each value of X, list the corresponding elementary outcomes. (c) Obtain...

Q: Th e time it takes a symphony orchestra to play Beethoven's Ninth

Th e time it takes a symphony orchestra to play Beethoven's Ninth Symphony has a normal distribution with a mean of 64.3 minutes and a standard deviation of 1.15 minutes. The next time it is played, w...

Q: The weights of apples served at a restaurant are normally distributed with

The weights of apples served at a restaurant are normally distributed with a mean of 5 ounces and standard deviation of 1.2 ounces. What is the probability that the next person served will be given an...

Q: Th e diameter of hail hitting the ground during a storm is

Th e diameter of hail hitting the ground during a storm is normally distributed with a mean of .5 inch and a standard deviation of .1 inch . What is the probability that: (a) A hailstone picked up at...