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erastova [34]
2 years ago
7

Helppppp I really need this asap

Mathematics
1 answer:
Vlada [557]2 years ago
8 0

Answer:

gago putangina mo bold

panget

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Assume that females have pulse rates that are normally distributed with a mean of
juin [17]

Step-by-step explanation:

a. First, find the z-score.

z = (x − μ) / σ

z = (80 − 74.0) / 12.5

z = 0.48

Use a calculator or table to find the probability.

P(z < 0.48) = 0.6844

b. Find the standard deviation of the sample.

σₓ = σ / √n

σₓ = 12.5 / √4

σₓ = 6.25

Find the z-score.

z = (x − μ) / σ

z = (80 − 74.0) / 6.25

z = 0.96

Use a calculator or table to find the probability.

P(z < 0.96) = 0.8315

c. When the distribution of the population is normal, then the distribution of the sample mean is also normal.

5 0
4 years ago
A researcher wants to determine whether the rate of water flow (in liters per second) over an experimental soil bed can be used
pantera1 [17]

Here we are given the specific equation of:

amount of eroded soil = 0.4 + 1.3 x

where x is the flow rate

 

A linear equation has a general formula in the form of:

y = m x + b

where m is the slope and b is the y intercept of the equation

 

If we compare this with our specific equation, we can see that the slope and y intercept are both positive with values:

m = 0.4

b = 1.3

Therefore this only means that as the flow rate increases, the amount of eroded soil also increases.

Hence the correlation must be positive but we cannot solve for the exact value since we need the data for x and y.


Answer: 

positive, but we cannot say what the exact value is

4 0
3 years ago
Janet plants 20 varieties of flowers in the spring . She reports that 90% of the flowers she have planted bloomed
SIZIF [17.4K]

Answer:

18

Step-by-step explanation:

90% of 20 is 18

8 0
3 years ago
Read 2 more answers
100 this time lol sorry about last time
I am Lyosha [343]

Answer:

1. 1

2. 40

3. 36

Step-by-step explanation:

brainliest?

5 0
3 years ago
Read 2 more answers
You and your friend each start a car-washing service. You spend $25 on supplies and charge $10 per car. Your friend spends $55 o
Inga [223]
For this you can write equations for your business and your friend's. For your's it would be y=10x-25 and for your friend's it would be y=13x-55. Now at this point you can just plug in numbers until you match up. Your answer would be 10, if you want to you can plug it in to check.
3 0
3 years ago
Read 2 more answers
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