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USPshnik [31]
3 years ago
13

For a sample of n=64​, the probability of a sample mean being less than 20.5 if u = 21 and sigma = 1.31 is ​(Round to four decim

al places as​ needed.) Would the given sample mean be considered​ unusual?
Mathematics
1 answer:
Svetlanka [38]3 years ago
6 0

Answer:

The mean is usual

Step-by-step explanation:

We have that the mean (m) is equal to 21, the standard deviation (sd) = 1.31 and the sample size (n) = 64

They ask us for P (x <20.5)

For this, the first thing is to calculate z, which is given by the following equation:

z = (x - m) / (sd / (n ^ 1/2))

We have all these values, replacing we have:

z = (20.5 - 21) / (1.31 / (64 ^ 1/2))

z = -3.05

With the normal distribution table (attached), we have that at that value, the probability is:

P (z <-3.05) = 0.0002

The mean is usual because P (x> 20.5) = 1 - P (x <20.5) = 1 - 0.0002 = 0.9998 is a fairly high probability.

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A sound wave is traveling at 6,420m/s and has a frequency of 600Hz. What is the wavelength?
GaryK [48]

Answer:

10.7 m

Step-by-step explanation:

Given that,

The speed of a sound wave, v = 6,420 m/s

The frequency of the wave, f = 600 Hz

We need to find the wavelength of the wave. We can find it using the below relation as follows :

v=f\lambda\\\\\lambda=\dfrac{v}{f}\\\\\lambda=\dfrac{6420}{600}\\\\\lambda=10.7\ m

So, the wavelength of the sound wave is equal to 10.7 m.

4 0
3 years ago
If g(x) is the inverse of f(x)=4x+12 and f(x)=, what is g(x)
Nitella [24]
Hello,
f(x)=y=4x+12

x=4y+12
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6 0
3 years ago
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sineoko [7]
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8 0
3 years ago
F(x)=2-3x I need help with this please
Fynjy0 [20]

Answer:

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Step-by-step explanation:

5 0
3 years ago
How do you do these questions?
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(e) csc x − cot x − ln(1 + cos x) + C

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∫ 1 / (1 + cos x) dx + ∫ sin x / (1 + cos x) dx

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= -∫₀⁷ erf(x) dx + ∫₀⁷ erf(x) dx

= 0

7 0
3 years ago
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