Answer:
(22.74,24.06) is the required 95% confidence interval for the population mean ACT score of University of Oklahoma students.
Step-by-step explanation:
We are given the following in the question:
Sample size, n = 121
Sample mean = 23.4
Sample standard deviation = 3.65
Level of significance = 0.05
Degree of freedom
95% Confidence interval:
Calculation of critical value:
Putting the values, we get,
(22.74,24.06) is the required 95% confidence interval for the population mean ACT score of University of Oklahoma students.
Answer: 15 months
Step-by-step explanation:
Her balance after paying the registration fee is $300. Then we need to divide this remaining money into as many chunks (months )of $20. So we do 300/20 = 15 months
Answer:
see below
Step-by-step explanation:
The perimeter is the sum of all the sides
A + B+ C+ D + E = 190
x+5 + x+10 + -5(x-20) + 6x-10+ 2x+4(20-x) = 190
Distribute
x+5 + x+10 -5x+100 +6x-10 +2x +80 -4x = 190
Combine like terms
x + x -5x-4x+6x +2x +80+10+100 -10+5 = 190
x +185 = 190
Subtract 185 from each side
x+185-185 = 190-185
x = 5
Side A = x+5 =5+5 =10
Side B = x+10 = 5+10 =15
Side C = -5(x-20) = -5(5-20) = -5(-15) = 75
Side D = 6x-10 = 6(5) -10 =30-10 = 20
Side E = 2x+4(20-x) = 2*5 +4(20-5) = 10+4(15) = 70