An organization tracking college expenses reported that the average cost of textbooks and supplies for students attending four-year public colleges and universities in the 2015-16 academic year is . Suppose a sample of 15 students was selected and the accompanying data reflect the amount they paid for textbooks and supplies during that year. $1,358 $1,204 $1,207 $1,062
$1,316 $1,38 $1,554 $1,501 $1,421
$1,398 $1,223 $1,382 $1,542 $1,176

Required:
a. Calculate the mean and standard deviation.
b. Determine the number of standard deviations the most extreme cost is away from the mean. If someone were to advise a prospective student concerning the money the student should save to afford the cost of books and supplies for one year for at least 90% of the colleges, determine the amount they would suggest.

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations:

110698.56 square miles

step-by-step explanation:

multiply 3.8 by 102

387.6

multiply 2.8 by 102

285.6

multiply those two to get

(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.