Asimple random sample of 30 students was selected from a normally distributed population of high school students. the following confidence intervals were calculated at 90, 95, and 99% confidence levels to estimate the average number of hours of sleep the students got each night. determine which confidence level goes with each confidence interval. between 7.3 and 8.7 hours of sleep: between 7.0 and 9.0 hours of sleep: between 7.2 and 8.8 hours of sleep:

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116

it would open into a square depending on the type of envelope i’m not sure about the second part

step-by-step explanation:

1. 2

2. 11

3. 5

4. 6

5. 7

6. 5

7. -1

8. 1

step-by-step explanation: