Scores on a test are normally distributed with a mean fo 69.2 and a standard deviation of 9.4, find p81

Which number produces a rationale number when multiplied by 1/5

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

Student representatives surveyed their classmates on their preference of a school mascot for a new school. the results are shown in the table below. which pair of samples seems most representative of student preference?