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alexira [117]
3 years ago
7

Assume the standard deviation is $410 and that the amounts refunded follow a normal probability distribution. 1. What percent of

the refunds are more than $3,100? 2. What percent of the refunds are more than $3,100 but less than $3,500? 3. What percent of the refunds are more than $2,250 but less than $3,500?
Mathematics
1 answer:
Yakvenalex [24]3 years ago
3 0

Answer:

idk

Step-by-step explanation:

ndjwije ndjwijeyijg inetbauhfbuabwivahwonrvu8

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What is the value of 1/2 + (-5/6) + 1/4?<br> 1. -7/12<br> 2. -1/12<br> 3. 1/12<br> 4. 1 7/12
algol [13]

Answer:

The answer is 4

Step-by-step explanation:

1/2+(-5/6)= 1 1/3

1 1/3 + 1/4= 1 7/12

5 0
2 years ago
The midpoint of y and 31 is -5. what is y
pochemuha
Y = -41.
EXPLANATION.
if -5 is the midpoint, it must be -5 + 36.
Because there is 36 numbers between 31 and -5.
So -5 + 36 = -41.
4 0
3 years ago
In a random sample of 500 handwritten zip code digits, 464 were read correctly by an optical character recognition (OCR) system
In-s [12.5K]

Answer:

z= 2.38

P = 0.008656

Step-by-step explanation:

Here n= 500 and p~= 464/500= 0.928 and q`= 1- 0.928 = 0.072

We formulate our null and alternate hypothesis as

H0 =  0.9 ;       H0 > 0.9

The degree of confidence = 90%

z₀.₀₅ = 1.645 for  α= 0.05

We use the test statistic

z=  x- np/√npq

z= 466-500 *0.9/ √500 * 0.9(1-0.9)

z= 466- 450/ √45

z= 16/6.7082

z= 2.38

As the calculated value of z= 2.38  is greater than α =1.645 so we reject H0.

If H0 is true the P value is calculated as

P = 1- Ф( 2.38)

P = 1-0.991344=0.008656

7 0
3 years ago
The length of a rectangle is 5 yards more than the width x. The area is 592 yards squared.
omeli [17]

Answer:

i think it might be 118.4

Step-by-step explanation:

4 0
3 years ago
In Alaya’s home state, an individual’s income tax is calculated as follows:
Stolb23 [73]
At 4200, the max tax is about 2,400 so to get to 3200 raise by 800 which is 1/3
so 1/3 of 4000
or do 16.66 times 3200 which gives u about 53333.33
5 0
3 years ago
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