The mean of the data set in the box below is -1
Answer:
2x + 7y + 37
Step-by-step explanation:
9+2(x+7)+7(y+2)
= 9 + 2x + 14 + 7y + 14
= 2x + 7y + 37
283333/100000 would be the answer
95% C.I. = mean + or - 1.96(standard deviation / sqrt(sample size))
95% C.I. = 57 + or - 1.96(3.5/sqrt(40) = 57 + or - 1.085 = 57 - 1.085 to 57 + 1.085 = 55.92 to 58.09
Therefore, 95% of the mean will occur in the interval 55.92 to 58.09