a random sample of 36 drivers use on average 749 gallons of gasoline per year at the standard deviation of the population is 32 gallons find a 95% confidence and I'm going to me for all drivers of a driver said that he used a. $3 a year would you believe that that ​

In a singing competition, there are 150 participants. at the end of each round, 40% of the participants are eliminated. how many participants are left after n rounds?

Kevin's bank offered him a 4.5% interest rate for his mortgage. if he purchases 3 points, what will be his new rate?

Afactory buys 10% of its components from suppliers b and the rest from supplier c. it is known that 6% of the components it buys are faulty. of the components brought from suppliers a,9% are faulty and of the components bought from suppliers b, 3% are faulty. find the percentage of components bought from supplier c that are faulty.