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zhannawk [14.2K]
3 years ago
12

What's a proportion that can be used to find out how many points a student needs to reach 78 percent on a 50 point quiz?

Mathematics
1 answer:
Katarina [22]3 years ago
7 0
Hope this helps
vote me brainliest

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jeka94

Answer:

-0.6, -1/4, 0.3, 1/2

Step-by-step explanation:

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3 years ago
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Suppose the heights of women at a college are approximately Normally distributed with a mean of 65 inches and a population stand
Zigmanuir [339]

Answer:

Step-by-step explanation:

Hello!

The variable of interest, X: height of women at a college, has an approximately normal distribution with mean μ= 65 inches and standard deviation σ= 1.5 inches.

You need to look for the value of height that marks the bottom 20% of the distribution, i.e. the height at the 20th percentile of the normal curve, symbolically:

P(X≤x₀)= 0.20

To know what value of height belongs to the 20% of the distribution, you have to work using the standard normal distribution and then reverse the standardization with the population mean and standard deviation to reach the value of X. So the first step is to look for the Z-value that accumulates 20% of the distribution:

P(Z≤z₀)=0.20

z₀= -0.842

z₀= (x₀-μ)/σ

z₀*σ= (x₀-μ)

x₀= (z₀*σ)+μ

x₀= (-0.842*1.5)+65

x₀= 63.737 inches

I hope it helps!

6 0
3 years ago
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Which ratio is equivalent to 9/27<br><br> A. 6/9<br><br> B. 1/2<br><br> C. 1/3<br><br> D. 3/12
shusha [124]

The correct answer is c.

a.6/9

b.1/2

<em><u>c.1/3</u></em>

d.3/12



8 0
3 years ago
Kevin finished a race in 25.7 minutes juile finished the race 7 1/10 sooner than kevin finished it how many minutes did it take
Papessa [141]

Answer:

18.6 minutes

Step-by-step explanation:

subtract. im sorry if this is not right. im not smart

5 0
2 years ago
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