Mileage tests were conducted on a randomly selected sample of 100 newly developed 5) automobile tires. The sample mean tread wear was 50,000 miles, with a population standard deviation of 3,500 miles. What is the best estimate of the average tread life in miles for the entire population of these tires?

1. if we have 3 babies what is the probability they’re going to be all boys? 2. if we roll 2 die at the same time what is the probability of getting less than 10 on the first roll and a 5 on the second roll 3. if we have 3 babies what is the probability their is going to be 2 girls? 4. if we have 3 babies what is the probability of having no more than 1 girl? 5. it we have 3 babies and then have another 3 babies what is the probability of us having at least 1 boy and then having all girls?

If y varies directly as x2 and y=6 when x=6, find the constant of variation.

If value of cos330° is √3/2 then find tan165°.