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Zanzabum
4 years ago
15

A gray-scale digital camera with 1,000,000 pixels takes a picture (the picture is made of 1,000,000 parts and each part has a ce

rtain amount of gray). A histogram is made where the data is the amount of gray in each of these parts. The histogram looks bell-shaped with a mean of 125 gray levels and a standard deviation of 15.
Approximately how many pixels have a gray scale of between 110 and 140?
A. 30
B. 500,000
C. 680,000
D. 950,000
Mathematics
1 answer:
Luden [163]4 years ago
3 0
The answer is 680000
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Order of Operations 4
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3 years ago
Please Help<br> Question; What is the value of x?
Maksim231197 [3]

Answer:

x+5/30 = 16/20

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Step-by-step explanation:

x+5/30 = 16/20

20x+100=480

20x=380

x=19

6 0
3 years ago
A school has 10 classes with the same number of students in each class. One day, the weather was bad and many students were abse
lora16 [44]
Five half-full classes + three 3/4 full classes + 2 1/8 empty (which is 7/8 full) classes altogether give us 10 classes without 70 students. Let's assume that one class is x, so we can write it as:

5 * 1/2x + 3 * 3/4x + 2 * 7/8x = 10x - 70

After multiplying and changing it to decimals:

2,5x + 2,25x + 1,75x = 10x - 70
6,5x = 10x - 70     / - 6,5x (both sides)
0 = 3,5x - 70     / + 70 (both sides)
70 = 3,5x     / :3,5 (both sides)
x = 20

Check:

5 * 1/2 * 20 + 3 * 3/4 * 20 + 2 * 7/8 * 20 = 10 * 20 - 70
5 * 10 + 3 * 15 + 2 * 17,5 = 200 - 70
50 + 45 + 35 = 130
130 = 130

Correct - there are 20 students in each class (200 students overall)

Answer: There are 200 students in the school when no students are absent.
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aliina [53]

Answer:4th option

Step-by-step explanation:

5 0
3 years ago
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