Ask question

Ask question

All categories

3 years ago

9

A set of mathematics exam scores are normally distributed with a mean of 80.280.280, point, 2 points and a standard deviation of

444 points. What proportion of exam scores are between 828282 and 85.685.685, point, 6 points? You may round your answer to four decimal places.

2 answers:

hichkok12 [17]3 years ago

5 0

Answer:

0.3745

Step-by-step explanation:

Data

mean ( $\mu$ ): 80

standard deviation ( $\sigma$ ): 4

Normal distribution table is in figure attached .

$Z = \frac{x - \mu}{\sigma
}$

Z = (85 - 80)/4 = 1.25

Area below curve = 0.3944

Z = (82 - 80)/4 = 0.5

Area below curve = 0.0199

Proportion of exam scores between 82 and 85?

0.3944 - 0.0199 = 0.3745

Gekata [30.6K]3 years ago

3 0

Answer: 0.3330 is right

Step-by-step explanation:

You might be interested in

All of the expressions that have the same value as LaTeX: 892\div8892 ÷ 8. Group of answer choices LaTeX: 8920\div808920 ÷ 80 La

algol13

Answer:

$(a)$ $8920\div80$

$(e)$ $0.892\div0.008$

Step-by-step explanation:

Given

$892\div8$

Required

Select equivalent expression

$8920\div80$

$894\div10$

$89.2\div0.08$

$8.92\div0.8$

$0.892\div0.008$

Start by solving the given expression (using a calculator)

$892\div8$ $= 111.5$

Then we solve the given options (using a calculator)

$(a)$ $8920\div80$

$8920\div80$ $= 111.5$

$(b)$ $894\div10$

$894\div10$ $= 89.4$

$(c)$ $89.2\div0.08$

$89.2\div0.08$ $= 1115$

$(d)$ $8.92\div0.8$

$8.92\div0.8$ $= 11.15$

$(e)$ $0.892\div0.008$

$0.892\div0.008$ $= 111.5$

The equivalent expressions are (a) and (e)

5 0

3 years ago

Maria wants to add to her CD collection. If a CD costs $9, which expression shows the cost of d CDs?

kap26 [50]

Cost = 9d (cost can be substituted with x, etc.)

4 0

3 years ago

You are biking at a speed of 18 miles per hour

CaHeK987 [17]

18 miles per hour is how fast you would go

8 0

3 years ago

Can someone please help!?

Novay_Z [31]

Answer:

x = 44.4°

Step-by-step explanation:

Use SOHCAHTOA.

In this case, use sine trigonometric function formula

$\sin(x) = \frac{o}{h}$

The opposite side of angle is 7.

The hypoteneuse is 10.

So,

$\sin(x) = \frac{7}{10} \\ x = \sin ^{ - 1} ( \frac{7}{10} ) \\ x = {44.427}^{o} \\ x = {44.4}^{o}$

8 0

3 years ago

Read 2 more answers

Evaluate - 6x(-4)-(-8).

Neko [114]

Answer:

32

Step-by-step explanation:

24-(-8) = 24+8 = 32 Answer

Hope this helps!

If you need further details, lmk.

3 0

3 years ago