The hourly rate of substitute teachers for 12 local school districts is given below. Assuming that the data are normally distributed, use a TI-83, TI-83 plus, or TI-84 calculator to find the 90% confidence interval for the mean hourly rate of substitute teachers in the region. Round your answers to two decimal places and use ascending order. 20 13 21 18 19 22
19 15 12 12 18 21

the answer is 3/5

step-by-step explanation:

first divide 24 divided by 8 because that is the least common multiple

then divide 40 by 8

then you will get 3/5.

step-by-step explanation:

the correct answer is $7.38

step-by-step explanation:

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a