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The probability that a student passes Math class is 60% and the probablility the student passes English is 80%. The probability that the student passes is 54%
In a chemical experiment, a solution is to be kept at 70 degrees Celsius. At a randomly selected time, the actual temperature is a normal random variable with mean 70 degrees Celsius and standard de
A computer receives input over a slightly faulty connection. For a particular transmission, 80% of the bits sent consists of 0's; the rest are 1's.
Find the following percentiles for the standard normal distribution. Interpolate where appropriate. (Round your answers to two decimal places.) (a) 71st
If the sizes of five independently selected droplets are measured, what is the probability that at least one exceeds 1455 µm? (Round your answer to four decimal places.)
What percent of all errors will the proofreader catch? (Hint: make a tree diagram.) (Round your answer to the nearest whole answer.)
Only 6% of calls made to residential numbers in New York City reach a person. What is the probability (±0.0001) that none of 6 calls made to New York City reaches a person?
Internet sites often vanish or move, so that references to them can't be followed. In fact, 16% of Internet sites referenced in major scientific journals are lost within two years after publication.
An instant lottery game gives you probability 0.017 of winning on any one play. Plays are independent of each other. If you play 3 times, the probability that you win on one or more of your plays is a
Compute the variance of x by the definition. Compute the variance of x by the short cut formula. Determine the standard deviation of x
According to the Mendelian theory of inherited charateristics, a cross ferilizatiopn of related species of red and white flowered plants produces a generation whose offspring contain 25% red-flowere
A research team conducted a study showing that approximately 10% of all businessmen who wear ties wear them so tightly that they actually reduce blood flow to the brain, diminishing cerebral functio
The moment generating function for a random variable X is given by Mx(t) = (1/4)+ (3/4)*(1/(1-t)), t>1. Determine formulas for the density function and distribution function. Sketch graphs for fx
If one of these respondents is randomly selected, what is the probability of getting someone who has been in a car accident? Round to the nearest thousandth, if necessary.
For the first 4 years interest is at 6% effective; for the remainder of the term interest is at 5% effective. Find the amount of the first payment.
A survey was completed and the following two wage classes were used: ($4 - $7) and ($7 - $10). What is the class interval for these wage classes?
Under a recent U.S. Food and Drug Administration (FDA) standard for food contaminants, 3.5 ounces of tomato sauce can have up to 30 fly eggs, and 11 ounces of wheat flour can contain 450 insect frag
According to Chemical Engineering Progress (Nov. 1990) approximately 30% of all pipework failures in chemical plants are caused by operator error.
In the following functions, evaluate c so that f(x) will be the probability density function:
Let the cumulative distribution function of the random variable Y be given by
The probability density function of the random variable x is given by f(x)= (3/2)x^2, -1<x<1, 0 elsewhere. Find the cumulative distribution function of the random variable X.
Forty-three percent of marriages end in divorce. You randomly select 15 married couples. Find the probability exactly 5 of the marriages will end in divorce.
Tire and Auto Supply is considering a 2-for-1 stock split. Before the transaction is finalized, at least two-thirds of the 1,200 company stockholders must approve the proposal. To evaluate the likel
According to the mendelian theory of inherited characteristics, a cross fertilization of related species of red-and-white flowered plants produces a generation whose offspring contain 25% red flower
justify that each cross fertilization of the red-and white flowered plants is a bernouli trial , let X be the number of red flowered plants in 5 pairs of the cross-fertilized