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sdas [7]
3 years ago
9

Anyone have a link to a good 8th grade study guide for math?

Mathematics
1 answer:
Delvig [45]3 years ago
5 0

Answer:

https://newpathworksheets.com/math/grade-8

Step-by-step explanation:

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If in a sample of 355 adult males, we have a mean total cholesterol level of 185 mg, with s = 16. What is the 95% confidence int
sladkih [1.3K]

Answer:

Step-by-step explanation:

We want to determine a 95% confidence interval for the mean total cholesterol level of all males.

Number of sample, n = 355

Mean, u = 185 mg

Standard deviation, s = 16

For a confidence level of 95%, the corresponding z value is 1.96. This is determined from the normal distribution table.

We will apply the formula

Confidence interval

= mean +/- z ×standard deviation/√n

It becomes

185 +/- 1.96 × 16/√355

= 185 +/- 1.96 × 0.849

= 185 +/- 1.66404

The lower end of the confidence interval is 185 - 1.66404 =183.336

The upper end of the confidence interval is 185 + 1.66404 = 186.66

Therefore, with 95% confidence interval, the mean total cholesterol level of all males is between 183.336 mg and 186.66 mg

5 0
3 years ago
What is the value of x?<br><br><br><br> Enter your answer in the box.
Drupady [299]

Answer:

x = 111

Step-by-step explanation:

The sum of the interior angles of a polygon is

sum = 180° (n - 2) ← n is the number of sides

Here n = 7 , then

sum = 180° × 5 = 900

Sum the interior angles and equate to 900

x + 139 + 121 + 125 + 126 + 158 + 120 = 900

x + 789 = 900 ( subtract 789 from both sides )

x = 111

5 0
2 years ago
I need help to fide m&lt;BCA​
blondinia [14]

Answer:

57

Step-by-step explanation:

exterior angles add up to 360 so'

9x+1+5x+12+10x-37

24x-24=360

24x=384

x=16

10(16)-37

160-37

123

180-123

= 57

4 0
3 years ago
Write an equation perpendicular to x-3y=3 passes through (5,-9)
kherson [118]
3y=x-3
y=1/3x-1
Perpendicular slope: -3
y=-3x+b
Plug in the coordinates in the equation:
-9=-3(5)+b
-9=-15+b
4=b
Equation: y=-3x+4
Also, when finding the perpendicular slope you take the reciprocal of the original slope and make it negative if it is positive and make it positive if it’s negative.
8 0
3 years ago
34.1 divided by what equals 22
allochka39001 [22]
I hope this helps you

3 0
2 years ago
Read 2 more answers
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