Exam 26: Introduction to Statistics and Probability

If we throw two dice, what is the chance that their sum is 11 ?

A random sample of 500 parts found 20 to be defective. Find the 95% confidence interval for the population proportion.

A certain circuit has a resistance that is normally distributed with a mean of $25.0 \Omega$ and a standard deviation of $1.0 \Omega$ . What is the probability of circuit having a resistance between $23.2 \Omega$ and $24.6 \Omega$ ?

Define the following type of data as continuous, discrete, or categorical: Time spent watching television each week

The following table shows the number of computers (in millions) sold in the years 1996-2010: Make an x-y graph of the sales versus the year.

A random sample of 60 new cars found a mean cost of $\$ 27,500$ with standard deviation of $\$ 4750$ . Find the $68 \%$ confidence interval for the population mean.

The amount of caffeine in a cup of coffee is normally distributed with a mean of $95.0 \mathrm{mg}$ and a standard deviation of $10.0 \mathrm{mg}$ . What amount of caffeine will $5 \%$ of coffee will have less caffeine than?

In a cell phone transmission tower there is a 0.002 probability of an intermittent power short circuit and a 0.01 probability of a faulty fuse. What is the probability of a short circuit or faulty fuse or both occurring? Assume that a short circuit and a faulty fuse occur independently.