Scarlett earned a score of 680 on Exam A that had a mean of 700 and a standard deviation of 40. She is about to take Exam B that has a mean of 39 and a standard deviation of 10. How well must Scarlett score on Exam B in order to do equivalently well as she did on Exam A? Assume that scores on each exam are normally distributed.

answer: the correct one is a

step-by-step explanation:

3 is greater then both of those numbers

(a) {a₁, a₁r, a₁r², … a₁rⁿ⁻¹, …}

(b) $59 398

step-by-step explanation:

(a) the annual sequence of profits

aₙ = a₁rⁿ⁻¹

the model for the sequence of profits is {a₁, a₁r, a₁r², … a₁rⁿ⁻¹, …} .

(b) profit after 15 yr

  a₁ = $ 30 000

  r = 1.05

a₁₅ = 30 000 × 1.05¹⁴

a₁₅ = 30 000 × 1.979 93

a₁₅ = $59 398

the profit in year 15 will be $59 398.

well since the real answer is 8.9 i guess the estimation would be 9