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fenix001 [56]
2 years ago
13

My brothers and sister, i need help asap

Mathematics
1 answer:
exis [7]2 years ago
8 0

Answer:

Step-by-step explanation: 3 or 4th option

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A supervisor records the repair cost for 14 randomly selected refrigerators. A sample mean of $79.20 and standard deviation of $
Nitella [24]

Answer:

( $74.623, $83.777)

The 90% confidence interval is = ( $74.623, $83.777)

Critical value at 90% confidence = 1.645

Step-by-step explanation:

Confidence interval can be defined as a range of values so defined that there is a specified probability that the value of a parameter lies within it.

The confidence interval of a statistical data can be written as.

x+/-zr/√n

Given that;

Mean x = $79.20

Standard deviation r = $10.41

Number of samples n = 14

Confidence interval = 90%

Using the z table;

The critical value that should be used in constructing the confidence interval.

z(α=0.05) = 1.645

Critical value at 90% confidence z = 1.645

Substituting the values we have;

$79.20+/-1.645($10.42/√14)

$79.20+/-1.645($2.782189528308)

$79.20+/-$4.576701774067

$79.20+/-$4.577

( $74.623, $83.777)

The 90% confidence interval is = ( $74.623, $83.777)

5 0
3 years ago
The 8 red markers in a package account for 4% of all markers in the package. How many markers are in the package?
Vlad [161]

Answer:

192 markers

Step-by-step explanation:

if 8 = 4% then 2=1%

so we can assume there are 200markers in the package.

8-200= 192 markers

6 0
2 years ago
Given:<br> cos(2x)=-1/9<br> Angle x is in quadrant I.<br> Find:<br> cos(x)
sergey [27]
My opinion about this answer is 7
5 0
3 years ago
1. True False 3(2 + 4) = 3 x 2 + 4
Gnoma [55]

Answer:

1. False

2. True

3. False

4. True

5. True

4 0
3 years ago
Read 2 more answers
Six times the sum of a number and 5 is 2
Ilia_Sergeevich [38]

Answer:

Here's the sentence in an equation: 2 = 6(x + 5)

7 0
2 years ago
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