Suppose that a life insurance company insures 4100 fifty-year-old people in a given year. (Assume death rate of 7 per 1000 people.) The cost of the premium is $400 per year, and the death benefit is $60,000. What is the expected profit or loss for the insurance company?

Recall that the owner of a local health food store recently started a new ad campaign to attract more business and wants to know if average daily sales have increased. historically average daily sales were approximately $2,700. the upper bound of the 95% range of likely sample means for this one-sided test is approximately $2,843.44. if the owner took a random sample of forty-five days and found that daily average sales were now $2,984, what can she conclude at the 95% confidence level?

Can someone answer this question for me

If x-1 and x+3 are the factors of x3+10x2+ax+b find a and b