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True [87]
3 years ago
14

Max earned a 85% on his test. if there were 40 questions on the test how many did he get correct?

Mathematics
1 answer:
wel3 years ago
3 0
Max would have had to have gotten 34 out of 40 questions correct. Here's why:

\frac{x}{40} =  \frac{85}{100} 

(40)(85) = (x)(100)



3400 = 100x

 \frac{3400}{100} = x


34 =x

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The sampling distribution used when making inferences about a single population variance is?
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We use the chi-square distribution when making inferences about a single population variance.

Short Description of Chi-Square Distribution

The continuous probability distribution known as the chi-square distribution. The number of degrees of freedom (k) a chi-square distribution has determines its shape. This type of sampling distribution has a variance of 2k and a mean equal to its number of degrees of freedom (k). The range is of a chi-square distribution is from 0 to ∞.

Variance plays a key role in the analysis of risk and uncertainty. The sample variance, an unbiased estimator of population variance, is expressed by the following formula of core statistic for a sample size 'n' and Y' as the sample mean:

S² = ∑(Yₓ - Y') / (n-1)

The formula, (n-1)S² / σ² has the central chi-square distribution as χ²ₙ₋₁. Here (n-1) represents the degrees of freedom.

Learn more about chi-square distribution here:

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4 0
1 year ago
What is (3x-5)+(-4x+1)
scoundrel [369]

Answer:

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Step-by-step explanation:

3 0
2 years ago
What is an exponent? Because i am confused
ollegr [7]

An exponent is a number written above and to the right side of a value or number in math. The value or number is called the base, and the expression is read out as;

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An example is given below;

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In this example, 10 is the base and 3 is the EXPONENT.

The expression is now read out as,

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Note that even unknown values (such x as we commonly use in math) can also be an exponent or base. For example, we can have;

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8 0
1 year ago
Games Galore Super Store buys the latest video game at a wholesale price of $30.00. The markup rate at Game's Galore Super Store
marishachu [46]

Answer:

<h2>$42</h2>

Step-by-step explanation:

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For example, if a product sells for $125 and costs $100, the additional price increase is ($125 – $100) / $100) x 100 = 25%.

Given data

firstly let us solve for 40% of $30

=40/100*30

=0.4*30

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therefore the sale price will be the markup rate plus the initial price

<em>Hence the you will have to pay 12+30=$42</em>

6 0
2 years ago
$29,000; 4% decrease
Sveta_85 [38]

Answer:

$27,840 is the correct answer

Step-by-step explanation:

hope this helps!

7 0
2 years ago
Read 2 more answers
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