Solve the following system of equations by substitution. 3x + 2y = -12 x = 2 a. (2, -9) b. (-2, -3) c. (3, 2) d. (2, 3)

Suppose a team of pedestrians takes a simple random sample of 100 babies. in this sample, the babies have a head circumference of 46.35 cm and a standard deviation of 1.1 cm. what percent of the time would a random sample of 100 babies a sample mean that is not in the 90% confidence interval? a) 0% b)2.5% c)5% d)10%