All categories

2 years ago

On a standardized exam, the scores are normally distributed with a mean of 135 and a

Mathematics

1 answer:

labwork [276]2 years ago

3 0

Answer:

-1

Step-by-step explanation:

mean, mu = 135.

Standard deviation = 20

X = 115

use the z score formula : $z = \frac{x-mu}{standard deviation}$

to get (115-135)/20 = -1

You might be interested in

-3r-8(8r+8)=-9(-4+9r)

natulia [17]

Answer:

r= 7.14 (rounded to 2 decimal places)

Step-by-step explanation:

We have to solve this equation for the value of r. We will use distributive property and basic algebra to solve this.

Distributive property is a(b+c) = ab + ac

Now, the steps of solving are shown below:

$-3r-8(8r+8)=-9(-4+9r)\\-3r -64r-64=36-81r\\-67r-64=36-81r\\-67r+81r=36+64\\14r=100\\r=\frac{100}{14}\\r=7.14$

Hence, value of r is 7.14 (rounded to 2 decimal places)

8 0

3 years ago

(PLEASE ANSWER FAST!!!!) Two lines, A and B, are represented by equations given below: Line A: y = x – 2 Line B: y = 3x + 4 Whic

Sophie [7]

Answer:

(-3, -5), because the point satisfies both equations.

6 0

3 years ago

Current and Quick Ratios The Nelson Company has $1,250,000 in current assets and $500,000 in current liabilities. Its initial in

murzikaleks [220]

Answer:

Step-by-step explanation:

$1,250,000 in current assets (cr) and $500,000 in current liabilities(cl)

current ratio (cr)=1250000/500000=2.5

Δ note payable ( change in note payable NP)

minimum current=2.2

2.2=(1250000+ΔNP)/(500000+ΔNP)

2.2(500000+ΔNP)=1250000+ΔNP

1100000+2.2ΔNP=1250000+ΔNP

2,2ΔNP-ΔNP=1250000-1100000

1.2ΔNP=150000

ΔNP=150000/1.2=125000

Nelson's short-term debt (notes payable) increase without pushing its current ratio below 2.2=125000

assuming this amount used to increase the inventory

new inventory=335000+125000=360000

current asset= 1250000+125000=1375000

the new ratio=(1375000-360000)/500000+125000

new ratio = 1.624

4 0

3 years ago

Please help me. After charging for 1/3 of an hour, a phone is at 2/5 of its full power. How long will it take the phone to charg

yanalaym [24]

Answer:

Step-by-step explanation:

5 0

3 years ago

In arizona 85% of the days are sunny how many are there in an average year

balandron [24]

306 Days are sunny in an average year in Arizona.

8 0

3 years ago