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4 years ago

6

Omg please help me please

1 answer:

makkiz [27]4 years ago

4 0

I got
x=100
y=80
but it's not listed

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The scores of fourth grade students on a mathematics achievement test follow a normal distribution with a mean of 75 and standar

mamaluj [8]

Answer:

The appropriate solution is:

(a) 0.1056

(b) 0

(c) 0.9544

Step-by-step explanation:

The given values are:

Mean,

$\mu = 75$

Standard deviation,

$\sigma = 4$

(a)

⇒ $P(x>80)=1-(x$

$=1-P[\frac{x-\mu}{\sigma}$

$=1-P[\frac{x-\mu}{\sigma}$

$=1-P(z$

By using the table, we get

$=1-0.8944$

$=0.1056$

(b)

According to the question, the values are:

$n$ = 64

$\mu_\bar{x}$ = 75

Now,

⇒ $\sigma_\bar{x}$ = $\frac{\sigma}{\sqrt{n} }$

= $\frac{4}{\sqrt{64} }$

= $\frac{4}{8}$

= $0.5$

⇒ $P(\bar {x} >80 ) = 1 - P(\bar x$

$=1 - P[\frac{(\bar x-\mu_\bar x)}{\sigma \bar x} < \frac{80-75}{0.5} ]$

$=1-P(z$

By using the table, we get

$=1-1$

$=0$

(c)

As we know,

⇒ $\sigma_\bar x$ = $\frac{\sigma}{\sqrt{n} }$

= $\frac{4}{\sqrt{64} }$

= $\frac{4}{8}$

= $0.5$

then,

= $P(74< \bar x$

= $P[\frac{74-75}{0.5} < \frac{\bar x-\mu \bar x}{\sigma \bar x} < \frac{76-75}{0.5} ]$

= $P(-2$

= $P(z$

By using the table, we get

= $0.9772-0.0228$

= $0.9544$

7 0

3 years ago

Can someone please help me

Anettt [7]

Answer:

y = -6x + 9/4

Step-by-step explanation:

y = mx + b

m= -6

b 9/4

7 0

3 years ago

The smelliness of cheese (denoted by S) can be defined as a function of the number of bacteria in the cheese (denoted by B) and

DedPeter [7]

Answer: OPTION C.

Step-by-step explanation:

Given the following formula:

$S=B*A$

You know that "S" is the smelliness of cheese, "B" is the number of bacteria in the cheese and "A" is the surface area in square centimeters of the cheese.

For example, suppose that there are $3,000\ bacterias$ in a surface area of $60 \ cm^2$ .

Substitute into the formula these values:

$B=3,000\ bacterias\\\\A=60\ cm^2$

And then evaluate:

$S=(3,000\ bacterias)(60\ cm^2)\\\\S=180,000\ bacterias*cm^2$

Therefore, you can conclude that the appropriate measurement unit for "S" is:

$bacterias*cm^2$

6 0

3 years ago

Help. I need an 80 in math by Friday, brainliest if you can help.

ehidna [41]

Answer:

26

Step-by-step explanation:

To find the area of the three combined shapes, multiply the length times the width of each and add them together. Five times two is 10, and since there are two identical rectangles (the top and the bottom one), the current combined area is 20. Three times two is 6. 20 + 6 = 26.

4 0

3 years ago

How do you get the answer to 1+1?

sveticcg [70]

Answer:

2

Step-by-step explanation:

If we take 1 and add another 1, you will get 2

5 0

3 years ago

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