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LenKa [72]
2 years ago
12

76. 30 students at a sports event are

Mathematics
1 answer:
katrin2010 [14]2 years ago
4 0

Answer:

75 students

Step-by-step explanation:

So firstly lets make convert these words to alegbra :

30 people are 40%of the total students at the event meaning that the following equation can be made :

30 = 40% of x    (x is the unknown amount of students there)

30 = 40% * x

30 = 0.4x (we can convert the precentage into a decimal by dividing by 100)

Now that we have the equation that 30 = 0.4x we can evalute it and find x :

30=0.4x

30/0.4=0.4x/0.4 (divide by 0.4 on both sides)

75=x

So thats how we get that 75 students were in the event in total.

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Step-by-step explanation:

80 divided by 2 is 40 plus 80 would be 120 which is 6 minutes worth of filling

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3 years ago
Express each decimal as a fraction in simplest form. help-
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Answer:

1. 1/2

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2 years ago
Listed below are prices in dollars for one night at different hotels in a certain region. Find the​ range, variance, and standar
Vanyuwa [196]

Answer:

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Variance = $1915.2857

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Step-by-step explanation:

Given the data:

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Arranging in ascending order :

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The range = 234 - 119 = 115

The variance :

Σ(x - mean)²/n-1

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The mean = 1356 / 8 = 169.5

Variance :

Σ(x - mean)² = (119-169.5)² + (131-169.5)² + (141-169.5)² + (146-169.5)² + (160-169.5)² + (207-169.5)² + (218-169.5)² + (234-169.5)² = 13407

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Variance = 13407 / 7 = 1915.2857

Standard deviation = √variance

Standard deviation = √1915.2857

Standard deviation = $43.764

8 0
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