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DedPeter [7]
2 years ago
5

If students’ scores were normally distributed and the mean was 200 with a standard deviation of 40, then what is the probability

, in percentages, that it is below 240?

Mathematics
1 answer:
Sonja [21]2 years ago
4 0

Answer:

  84%

Step-by-step explanation:

The empirical rule tells you that 68% of the standard normal distribution is within 1 standard deviation of the mean. The distribution is symmetrical, so the amount in the lower tail is (1 -68%)/2 = 16%.

Since the number you're interested in, 240, is one standard deviation above the mean (200 +40), the percentage of interest is the sum of the area of the central part of the distribution along with the lower tail:

  68% + 16% = 84%.

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What is the measure of x?
UkoKoshka [18]

Answer:

x=4

Step-by-step explanation:

(whole secant) x (external part) = (tangent)^2

(x+5) *x = 6^2

x^2 +5x = 36

Subtract 36 from each side

x^2 +5x - 36 = 0

Factor

( x-4) (x+9) = 0

Using the zero product property

x-4 = 0  x+9 =0

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7 0
2 years ago
How many solutions does the equation 6y - 3y -7 = -2 +3 have?
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Answer:

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8 0
3 years ago
Numbers like 10, 100, 1000 are called?
Y_Kistochka [10]
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10= 10^1
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and so on...
5 0
3 years ago
Read 2 more answers
Write the equation of a line that includes the point (-4 , 0) and has a slope of -3/5 in slope intercept form
erastovalidia [21]
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______________________________________________ 
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3 years ago
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sattari [20]

(-7,-5)

Step-by-step explanation:

3x-8y = 19

minus

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Hope this helps!

4 0
2 years ago
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