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Whitepunk [10]
3 years ago
14

The scores on a test are normally distributed with a mean of 19 and a standard deviation of 5

Mathematics
1 answer:
kiruha [24]3 years ago
3 0

Answer:

24.18 is the required score to get into the top 15%.

26.03 is required to get into the 92nd percentile.

Step-by-step explanation:

On a TI-84 calculator:

You can use the invNorm function to calculate the point at a given percentage on a normal model

invNorm(area, mean, sd, tail)

Plug in the values and calculate:

invNorm(0.15, 19, 5, RIGHT)

24.18 is the required score to get into the top 15%.

92nd percentile means that this score is better than 92% of scores

Plug in values and calculate:

invNorm(0.92, 19, 5, LEFT)

26.03 is required to get into the 92nd percentile.

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AfilCa [17]

Answer:

The answer would be D. 5

Step-by-step explanation:

4 0
2 years ago
The sum of two numbers is 126 and their difference is 42. what are two numbers
Snowcat [4.5K]

Answer:

<h2>84, 42</h2>

Step-by-step explanation:

x,\ y-numbers\\\\\text{The system of equations:}\\\\\underline{+\left\{\begin{array}{ccc}x+y=126\\x-y=42\end{array}\right}\qquad\text{add both sides of the equations}\\.\qquad2x=168\qquad\text{divide both sides by 2}\\.\qquad x=84\\\\\\\text{Put the value of}\ x\ \text{to the first equation:}\\\\84+y=126\qquad\text{subtract 84 from both sides}\\y=42

8 0
3 years ago
I have no idea!! Please help!!!
Ber [7]
The area of a traingle is \frac{1}{2}bh
So we need to know the base and the height
To work out the sides of a right angle triangle we can use a²+b²=c
c is the hypotenuse and a and b are the other sides
Because this triangle is isoceles we know that a and b are the same

a²+b²=c²
a²+a²=c²
2a²=c²
2a²=(x√6)²
2a²=(x√6)(x√6)
2a²=x²+x√6+x√6+6
2a²=x²+x√6+x√6+6
a²=\frac{x^{2}+x \sqrt{6}+x \sqrt{6}+6 }{2}
a=\sqrt{\frac{x^{2}+x\sqrt{6}+x\sqrt{6}+6}{2}}

A=\frac{1}{2}bh
A=\frac{1}{2}a*a
A=\frac{1}{2}×\sqrt{\frac{x^{2}+x\sqrt{6}+x\sqrt{6}+6}{2}}×\sqrt{\frac{x^{2}+x\sqrt{6}+x\sqrt{6}+6}{2}}
A=\frac{1}{2}×\frac{x^{2}+x \sqrt{6}+x \sqrt{6}+6 }{2}
A=\frac{x^{2}+x \sqrt{6}+x \sqrt{6}+6 }{4}
8 0
3 years ago
A bread company makes 9 types of bread. A restaurant chain ordered 497 loaves of each kind of bread. How many loaves of bread in
Aleksandr [31]
9 types of bread....a restaurant orders 497 loaves of each type

so there are (497 * 9) = 4473 loaves ordered in total
7 0
3 years ago
Does anyone know how to answer this?
max2010maxim [7]
Given that
The length of the rectangle 4cm and the breadth is 3cm
Area of rectangle= length * breadth
Area= 4*3
= 12cm^2
Hope it helped
3 0
2 years ago
Read 2 more answers
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