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1 year ago

6

Jack's average in math for the first nine week was an 88. His second nine weeks average decreased 12.5 . What was his average fo

r the second nine wekks

1 answer:

pashok25 [27]1 year ago

5 0

The answer is that his average is 75.5 for the second nine weeks

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A law school administrator was interested in whether a student's score on the entrance exam can be used to predict a student's g

frutty [35]

Answer:

The correlation coeffcient for this case was provided:

r =0.934

And this coefficient is very near to 1 the maximum possible value, so then we can interpret that the relationship between the entrace exam score and the grade point average are strongly linearly correlated .

We can also find the $r^2$ who represent the determination coefficient and we got:

$r^2 = 0.934^2= 0.872$

And the interpretation for this is that a linear model explains appproximately 87.2% of the variability between the two variables

Step-by-step explanation:

Previous concepts

The correlation coefficient is a "statistical measure that calculates the strength of the relationship between the relative movements of two variables". It's denoted by r and its always between -1 and 1.

And in order to calculate the correlation coefficient we can use this formula:

$r=\frac{n(\sum xy)-(\sum x)(\sum y)}{\sqrt{[n\sum x^2 -(\sum x)^2][n\sum y^2 -(\sum y)^2]}}$

The correlation coeffcient for this case was provided:

r =0.934

And this coefficient is very near to 1 the maximum possible value, so then we can interpret that the relationship between the entrace exam score and the grade point average are strongly linearly correlated .

We can also find the $r^2$ who represent the determination coefficient and we got:

$r^2 = 0.934^2= 0.872$

And the interpretation for this is that a linear model explains appproximately 87.2% of the variability between the two variables

8 0

1 year ago

Let XXX and YYY be the following sets: X = \{9, 25\}X={9,25}X, equals, left brace, 9, comma, 25, right brace Y = \{1, 4, 9,16,25

Dmitry_Shevchenko [17]

Answer:

The answer is " $\bold{ \{\phi\}}$ "

Step-by-step explanation:

Given value:

$\ Set\ X = \{9, 25\} \\\\\ Set \ Y = \{ 1,4,9,16,25 \}\\\\Find: \\\\Set (X- Y) \\\\$

When we subtract set X - Y it means, that it will give only, that value which is not available on the set Y.

$\{X-Y\} = \{\phi\}$

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1 year ago

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Janet correctly answers 45 questions on her science test. There are 50 questions on the test. What percentage did she answer cor

riadik2000 [5.3K]

45/50 = 90/100 = 90%

7 0

2 years ago

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Renee, Susan, and Martha will share the cost to rent a vacation house for a week. Renee will pay 40% of the cost. Susan will pa

notsponge [240]

Answer:

Martha is incorrect.

Amount paid by Renee = $\$340$

Amount paid by Susan = $297.5

Amount paid by Martha = $\$212.5$

Step-by-step explanation:

Given: Renee will pay 40% of the cost. Susan will pay 0.35 of the cost.Martha will pay the remainder of the cost. Martha thinks she will pay 13 of the cost.

To find: Is Martha correct?

To find: amount paid by each of Renee, Susan, and Martha

Solution:

Percentage of an amount paid by Renee = 40%

Percentage of an amount paid by Susan = 35%

So,

Percentage of an amount paid by Martha = $100-40-35=25\%$

But Martha thinks she will pay 13 of the cost. So, she is incorrect.

Amount paid by Renee = $\frac{40}{100}(850)=\$340$

Amount paid by Susan = $\frac{35}{100}(850)=\$297.5$

Amount paid by Martha = $\frac{25}{100}(850)=\$212.5$

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1 year ago

A box contains ten cards labeled Q, R, S, T, U, V, W, X, Y, and Z. One card will be randomly chosen.

lina2011 [118]

Answer:

2/5

Step-by-step explanation:

Picking 4 cards out of 10, and as a fraction, it would be 2/5

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1 year ago

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