Coin tosses in a large class of introductory statistics students, the professor has each student toss a coin 16 times and calculate the proportion of his or her tosses that were heads. the students then report their results, and the professor plots a histogram of these several proportions. a. what shape would you expect this histogram to be? why? b. where do you expect the histogram to be centered? c. how much variability would you expect among these proportions? d. explain why a normal model should not be used here.

he used the algebra tiles correctly.

step-by-step explanation:

given : 3x(2x-1)

solution :

since he used algebra tiles .

armando's solution is the same in the solution shown in figure

as he distributed 2x into x and x and wrote them vertically

and also write   -1 vertically

and 3x into x and x and x and wrote it horizontally

performing the multiplication in the algebra tiles we get

and solving the given expression :

3x(2x-1)

since solving the expression using tiles   and solving the expression algebraically we get the same answer

thus   we can choose the first statement as the answer to this problem which is "he used the algebra tiles correctly".

answer: haha (: i’ll go see what it is

step-by-step explanation: