1.. In a survey of high school students, one third of those surveyed said they would vote for john. The survey is considered accurate to within 5 percent points, 19 times out of 20. If a high school has 1200 students, state the range of numbers john should expect.

2. A factory produces bolts that has an average length of 1.22 inch, with a standard deviation of 0.02 inch. To be sold, all bolts must have a length between 1.20 inch and 1.25 inch. What percent, to the nearest whole number, of the total production can be sold?

3. James raises husky dogs. He knows, from the data he has collectedover the years, that the masses of adult male dogs are normally distributed, with a mean of 23.6 kg and a standard deviation of 1.8 kg. He has 48 puppies this year. How many of them could he expect to have a mass greater than 20 kg when they grow up?

4.. Is this data set normally distributed? explain.

INTERVAL...........1-5 6-10 11-15 16-20 21-25 26-30

FREQUENCY... 2 9 22 35 15 6