Consider a population consisting of the number of teachers per college at small 2-year colleges. suppose that the number of teachers per college has an average μ = 150 and a standard deviation σ = 20.

a. use chebyshev's rule to make a statement about the minimum percentage of colleges that have between 90 and 210 teachers. (round your answer to two decimal places if necessary.)

(b) assume that the population is mound-shaped symmetrical. what proportion of colleges have less than 170 teachers?

X+ y = 5 ; x - y =3 solve using linear combination

Astudy was interested in determining if eating milk chocolate lowered someone's cholesterol levels. ten people's cholesterol was measured. then, each of these individuals were told to eat 100g of milk chocolate every day and to eat as they normally did. after two weeks, their cholesterol levels were measured again. is there evidence to support that their cholesterol levels went down? how should we write the alternative hypothesis? (mud = the population mean difference= before - after)a. ha: mud = 0b. ha: mud > 0c. ha: mud < 0d. ha: mud does not equal 0

Asquare and an equilateral triangle have the same perimeter. each side the triangle is 4 inches longer than each side of the square. what is the perimeter of the square