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lilavasa [31]
3 years ago
5

Calculate the change in GPE stored when a 15 kg post driver is lifted by 70 cm

Mathematics
1 answer:
LenaWriter [7]3 years ago
5 0
It is 3 if im wron letme know
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Scores on an english test are normally distributed with a mean of 31.5 and a standard deviation of 7.3. find the score that sepa
kobusy [5.1K]

Let X be the score on an english test which is normally distributed with mean of 31.5 and standard deviation of 7.3

μ = 31.5 and σ =7.3

Here we have to find score that separates the top 59% from the bottom 41%

So basically we have to find here x value such that area above it is 59% and below it is 49%

This is same as finding z score such that probability below z score is 0.49 and above probability is 0.59

P(Z < z) = 0.49

Using excel function to find the z score for probability 0.49 we get

z = NORM.S.INV(0.49)

z = -0.025

It means for z score -0.025 area below it is 41% and above it is 59%

Now we will convert this z score into x value using given mean and standard deviation

x = (z* standard deviation) + mean

x = (-0.025 * 7.3) + 31.5

x = 31.6825 ~ 31.68

The score that separates the top 59% from the bottom 41% is 31.68

3 0
3 years ago
What is the range if this function ?
Pavel [41]

Answer:

-4 to 0 (both -4 and 0 are included in the range because of the dots)

3 0
2 years ago
When Klorina swims with the current, she swims 10 km in 2 h. Against the current, she can swim only 8 km in the same time. How f
nasty-shy [4]

Answer:

Klorina's rate in still water is 4.5 km/h

Current's rate is 0.5 km/h

Step-by-step explanation:

Let

x km/h = Klorina's rate in still water

y km/h = current's rate

<u>With the current (current helps):</u>

Distance = 10 km

Time = 2 hours

Rate = x + y km/h

10=2(x+y)

<u>Against the current:</u>

Distance = 8 km

Time = 2 hours

Rate = x - y km/h

8=2(x-y)

Divide both equations by 2:

x+y=5\\ \\x-y=4

Add these equations:

x+y+x-y=5+4\\ \\2x=9\\ \\x=4.5\ km/h

Subtract these two equations:

(x+y)-(x-y)=5-4\\ \\x+y-x+y=1\\ \\2y=1\\ \\y=0.5\ km/h

4 0
2 years ago
A label printer prints 7 labels in 3.4 seconds. How long will it take to print 56 pages of labels?
Lena [83]

Answer:

27.20seconds

Step-by-step explanation:

hope this helped,brainliest?

5 0
3 years ago
What is the solution to this inequality?
algol13
  1. B hus5hoegu9r47jssnkiroohdd
7 0
2 years ago
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