91影视

Mean from Ex. 47 = 73.62

Standard Deviation from Ex. 65 = 14.48

Minimum = 55.20

Maximum = 122.40

To find the standard deviation where most of the permeability measurements will fall, we will first find k.

$$\begin{gathered} \stackrel{炉}{x}-ks=Max \\ 73.62-k(14.48)=122.40 \\ k(14.48)=122.40-73.62 \\ k(14.48)=48.78 \\ k=\frac{48.78}{14.48} \\ k=3.37 \end{gathered}$$

Therefore, we can say that most of the permeability measurements will fall between 3 standard deviations from mean.

We have used the Chebyshev Rule, because we did not have any information about the distribution of the data. And Chebyshev鈥檚 rule allows us to use it on any type of distribution.

Mean from Ex. 47 = 128.54

Standard Deviation from Ex. 65 = 21.97

Minimum = 50.40

Maximum = 150.00

To find the standard deviation where most of the permeability measurements will fall, we will first find k.

$$\begin{gathered} \stackrel{炉}{x}-ks=Max \\ 128.54-k(21.97)=150 \\ k(21.97)=150-128.54 \\ k(21.97)=21.46 \\ k=\frac{21.46}{21.97} \\ k=0.97 \end{gathered}$$

Therefore, we can say that most of the permeability measurements for condition 2 will fall approximately between1 standard deviations from mean.

Mean from Ex. 47 = 83.07

Standard Deviation from Ex. 65 = 20.05

Minimum = 52.20

Maximum = 129.00

To find the standard deviation where most of the permeability measurements will fall, we will first find k.

$$\begin{gathered} \stackrel{炉}{x}-ks=Max \\ 83.07-k(20.05)=129 \\ k(20.05)=129-83.07 \\ k(20.05)=45.93 \\ k=\frac{45.93}{20.05} \\ k=2.29 \end{gathered}$$

Therefore, we can say that most of the permeability measurements for condition 3 will fall between 2 standard deviations from mean.

Sandstone decays faster under Type B weathering, because most of the values in this group fall between 1 standard deviation from mean.