There are many ways to measure the reading ability of children. research designed to improve reading performance is dependent on good measures of the outcome. one frequently used test is the drp, or degree of reading power. it is known that the distribution of drp scores is normally distributed. a researcher suspects that the mean score µ of all third- graders in henrico county schools is different from the national mean, which is 32. to test her suspicion, she administers the drp to a random sample of 22 henrico county third-grade students. their scores were 40 26 39 17 42 18 24 43 46 27 19 47 19 26 37 34 15 45 41 39 31 46

answer:

1.14285714286

step-by-step explanation:

divide 40 into 35 and you will get your answer

1. when "a" is a root of a polynomial, (x -a) is a factor of it. for the three roots given, the factors of the desired polynomial are (x +2)(x -1/2)(x -3).

in order to make the leading coefficient be negative, we need to multiply this product by a negative number. any negative number will do, but we choose a small (magnitude) value that will eliminate the fraction: -2.

then

f(x) = -2(x +2)(x -1/2)(x -3) = -(x +2)(2x -1)(x -3)

= -(2x² +3x -2)(x -3)

= -(2x³ -3x² -11x +6)

f(x) = -2x³ +3x² +11x -6

2. a graph created by the desmos on-line graphing calculator is shown, and the zeros are highlighted.

3. as indicated in part 1, the multiplier of this equation can be anything and the zeros will remain the same. you want a negative leading coefficient, so the "anything" is restricted to any of the infinite number of numbers that will make that be the case.