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Chemists use pH to measure the acid/alkaline nature of compounds. A large vat of mixed commercial chemicals is supposed to have a mean pH of 6.3 and a standard deviation of 1.9 . Assume a normal distribution for pH values. If a random sample of 10 readings in a vat is taken and the mean pH is computed, find each of the following:
a) P(5.2 <= xbar)b) P(xbar<=7.1)c) P(5.2<= xbar<=7.1)
Consider following data on exam scores of 10 randomly selected students: Compute 3rd quartile of the exam scores.
What is the value of the population mean? What is the best estimate of this value?
Given the following data on hotel check-ins for a 6-month period:
Using the original data, estimate the population standard deviation with 90% probability.
For the past 20 years, the high temperature on April 15th has averaged (j = 62 degrees with a standard deviation of a = 8. Last year, the high temperature was 66 degrees.
Find out the required probabilities utilizing Binomial distribution. According to Best buy, 2/3 citizens have iPods. In a randomly selected group of 3 iPod owners.
The radius of the hole and the radius of the shaft. Let the random variable X denote the clearance, in millimeters. The probability density function of X is?
Among 100 people randomly chosen in a survey, exactly 10 stated that they believed that the elected representatives are honest most of the time.
To speed up the process in a blood testing procedure, blood samples from 3 people are combined into one mixture. The mixture will only test negative if all the individual samples are negative.
If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, what percentage of light bulbs have a life less than 2500 hours?
What is the probability that the next customer will request extra unleaded gas and fill the tank (A union B)?
Decide whether experiment is binomial, Poisson or neither based on info given. Each week man plays game in which he has a 21% chance of winning.
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