Probability that a certain machine
The probability that a certain machine will produce a defective item is 0.20. If a random sample of 6 items is taken from the output of the machine, what is the probability that there will be 5 or more defectives in the sample?
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A sociologist wishes to see if it is true that for the certain group of professional women, the average age at which they've their first child is 28.6 years.
For the distributions mentioned below, suppose that large samples of n have been selected from them, apply the central limit theorem and find out (a) the distribution of the sample mean (b) the variance of the distribution of sample mean (c) stand
Assume that three balls are randomly selected, without replacement, from urn containing 2 red, 4 white, and 5 blue balls. If we let X and Y denote respectively, the number of red as well as white balls chosen, Find out the joint probability frunct
The lifetimes of light bulbs produced by the company are basically distributed with mean of 1500 hours and standard deviation of 125 hours.
The number of bacteria in a drop of water from a lake has Poisson distribution with average of 0.5 bacteria/drop. A small dish containing four drops of water form the lake is placed under a microscope.
The lifetime of the flashlight battery is basically distributed about mean of 35.6 hr with standard deviation of 5.4 hr. Kevin chosen one of these batteries at random as well as tested it. Determine the probability that this one battery will last
The mean and standard deviation on the last test in Professor McIsaac history test were 75 and 8 respectively. Professor McIsaac though the scores were too high.
Estimate the sample size that is needed to estimate the true proportion of blue-eyed North Island college students if you want your estimate to be in 0.04 with a 90% confidence.
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