4 years ago

15 points!!!:

1 answer:

6 0

If you’re both working at a constant rate, then he would have one hour left when you go to help him. Since there are two of you, you accomplish the task twice as fast, in 30 minutes

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the school band sold t-shirts to fund a trip to play in a parade. they collected 570 and the band made 34% of that amount. how m

VMariaS [17]

You need to find 34% of $570.

1) Change 34% to a decimal: 0.034
2) Multiply 0.034 by $570:
0.034 • 570 = 19.38

The band made $19.38

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4 years ago

The ratio of boys to girls in the ninth grade is 7 to 9. there are 218 girls set up a proportion to model this information

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Answer:

24.2

Step-by-step explanation:

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3 years ago

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The height of an adult male is known to be normally distributed with mean of 175 cm and standard deviation of 6 cm. The 20th per

dusya [7]

Answer:

The height below which 20% of the persons lie equals 169.95 cm

Step-by-step explanation:

Given that

Mean height = 175 cm

Standard deviation = 6 cm

Hence for the given question we need to find the standard variate factor ( Z factor) corresponding to the 20% of the area under the standard normal distribution curve

Using the standard normal distribution tables we have Z factor corresponding to an area of 20% equals ( Z = -0.84166)

Thus we have

$Z=\frac{X-\bar{X }}{\sigma }\\\\\Rightarrow -0.84166=\frac{X-175}{6}\\\\\therefore X=-0.84166\times 6+175\\\\X=169.95cm$