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erik [133]
2 years ago
14

Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of 77 and a standard deviation

of
10. Use the TI-84 PLUS calculator to answer the following. Round the answers to at least two decimals.
(a) Find the 28th percentile of the scores.
(b) Find the 65th percentile of the scores.
(c) The instructor wants to give an A to the students whose scores were in the top 12% of the class. What is the minimum score
needed to get an A?
(d) Between what two values are the middle 64% of the scores? (Enter the smaller number in the first box.)
Mathematics
1 answer:
vekshin12 years ago
7 0
Are all of those questions I think it’s C
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Can someone please help me on this simple geometry question
Elan Coil [88]

Answer:

x=7

Step-by-step explanation:

The two lines indicate that it is an isosceles triangle. This means that the bottom two angles and lengths are the same.

To work this out you would first minus 104 from 180, this gives you 76. Then you would multiply 25 by 2, which gives you 50. This is because the angles are the same. Then you would add 50 to 76, which gives you 126. Then you would multiply 9 by 2, which gives you 18. This is because it is an isosceles triangle and the bottom two sides are the same. Then you would divide 126 by 18, which gives  you 7.

1) Minus 104 from 180.

180-104=76

2) Multiply 25 by 2.

25*2=50

3) Add 50 to 76.

50+76=126

4) Multiply 9 by 2.

9*2=18

5) Divide 126 by 18.

126/18=7

6) x=7

<u>Answer Checking:</u>

<u></u>

To check your answer you would work backwards. First you would multiply 7 by 18, which gives you 126. Then you would minus 50 from 126, which gives you 76. Then you would add 104 to 76, which gives you 180.

1) Multiply 7 by 18.

7*18=126

2) Minus 50 from 126.

126-50=76

3) Add 104 to 76.

104+76=180

<u>Because it is a triangle the internal angles all add up to 180. And so if your answer is 180 then the steps are correct.</u>

6 0
3 years ago
What is 3x-4y+7=3y+1
grin007 [14]

Answer: 3x-4y+7=3y+1

Step-by-step explanation:

Since there is no negative x positive 4 and no negative number up to 7 that is the same, and since there is no negative number up to 3y or negative 1 the number stays the same so the answer is 3x-4y+7=3y+1

4 0
2 years ago
If anybody can help me pls do
barxatty [35]

Step-by-step explanation:

5x64=32066=(320+x} 666x6={320+x)396=320+x=396-320

7 0
2 years ago
Which of the following graphed functions doesnt represent a function
Minchanka [31]

Answer:

The first graph.

Step-by-step explanation:

To determine whether or not a line is a function or not, you can use something called the vertical line test. If it fails the vertical line test, then it is not a function.

4 0
3 years ago
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Is the confidence interval equivalent to the expression is it equivalent to the expression?
Akimi4 [234]
<span>Two or more expressions (equations are examples) that are equal to or equivalent to each other; for example: (X+2)(X+4) = X^2+6X+8.</span>
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3 years ago
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