Answer:
You actually can use Desmos for this
Step-by-step explanation:
1.)Go to Desmos through google
2.) The website is free and you don't need an account
3.) enter in your equation
4.) If it acts up (never has for me) just ask me for help by question :)
The common denominator is (x+2)(x-2)
notice that x²-4 is the difference of two square
when you solve it you get (x+2)(x-2). (x+2) can go into (x+2)(x-2).
The mean ( average ) is given as 1200 hours.
The standard deviation is 200, sample size is 100.
Find the standard error:
√(200^2 / 100) = 20
Now calculate the confidence interval. For 95% the Z number is 1.96
Multiply Z by the standard error:
1.96 x 20 =39.2
Now find the range that the mean should be within:
1200 - 39.2 = 1160.8
1200 + 39.2 = 1239.2
The samples should be between 1160.8 and 1239.2 for a 95% confidence interval.
Since the average was 1050, which is below 1160.8 the bulbs are not in compliance.
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Answer:
Part A: 4/9
Part B: 12 students
Step-by-step explanation:
27 * 0.44444444 = 12 (this is the number of students who preferred snowboarding). So the fraction would be 12/27, which simplifies to 4/9.
