Bell-shaped distribution with a mean
The diameters of a new species of apple have a bell-shaped distribution with a mean of 7.26cm and a standard deviation of 0.39cm. Using the empirical rule, what percentage of apples have diameters that are greater than 8.04 cm?
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The standard deviation for using a certain radar speed detector is 0.68 mph for vehicle speeds around 45 mph. If you were traveling 42 mph in a 30 mph zone and if a police officer used this speed detector, what is the probability that you would be
The crew of the Starship Enterprise is considering launching a surprise attack against the Borg in a neutral quadrant. Possible interference by the Klingons, though, is causing Captain Picard and Data to reassess their strategy.
Let A denote the event that a disk has high shock resistance, and let B denote the event that a disk has high scratch resistance. If a disk is selected at random, determine the following probabilities. Input your answers in the
The prices of a gallon of milk at various stores in one town have a mean of $3.86 with a standard deviation of $0.13. Using Chebyshev's Theorem, what is the minimum percentage of stores that sell a gallon of milk for between $3.47 and $4.25. Round
Calculate the mean, variance and standard deviation of the age of individuals that purchased skateboarding shoes. Use 10 as the midpoint of the first class. Round answers to 2 decimal places.
In a sequence of 10 independent Bernoulli trials, where the probability of success is .4, what is the expected number of failures? (Variance?)
If X is a Poisson distributed random variable with a mean of 3, and Y is another Poisson distributed random variable with a mean of 2, and the two are independent, what is the varianceof the sum X+Y?
What is the expectation of the random variable W = X+Y+4. What is the variance of the random variable W?
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