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photoshop1234 [79]
3 years ago
7

Test scores in a Test were normally distributed with a mean of 75 and a standard deviation of 10. Carl scored 90 in the Test . W

hat is the z-score of Carl’s test score?
Mathematics
1 answer:
mylen [45]3 years ago
6 0

Answer:

Z-score = 1.5

Step-by-step explanation:

Z-score = (x-mean)/standard deviation

= (90-75)/10

= 1.5

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HELP WILL MARK BRAINLIEST!!!
Rainbow [258]

Answer:

Let's see what to do buddy..

Step-by-step explanation:

_________________________________

STEP (1)

We know that the quadratic functions form are like this :

y = a  \: {x}^{2} + b \: x + c

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a > 0

The axis of parabolic symmetry passes through the vertex of the parabolic.

So we know that x vertex is equal to -2.

The vertex's x is finding from this equation:

x =  -  \frac{b}{2a} \\

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_________________________________

STEP (2)

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y = f(x) =  a{x}^{2} + bx + c \\  \\b = 4a \\  \\  y = f(x) = a {x}^{2} + 4ax + c

f( - 3) = 2 \\  \\ a ({ - 3})^{2} + 4a( - 3) + c = 2 \\  \\ 9a - 12a + c = 2 \\  \\ - 3a + c = 2 \\  \\  \\  \\ f(0) = 11 \\  \\ a ({0})^{2} + 4a(0) + c = 11 \\  \\ c = 11

- 3a + c = 2 \\  \\ c = 11 \\  \\  - 3a + 11 = 2 \\ 11 \: goes \: to \: the \: other \: side \:  \\  \\  - 3a = 2 - 11 \\  - 3a =  - 9 \\ divided \: the \: sides \: of \: the \: equation \: by \:  - 3 \\ a = 3

And we're done.

Thanks for watching buddy good luck.

♥️♥️♥️♥️♥️

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