Answer:
the answer is -1
Step-by-step explanation:
-1/-1 is the fraction lol
Answer:
Where the question at
Step-by-step explanation:
The average atomic mass is 6.92X
How do we compute the average atomic mass?
In a bid to calculate the average atomic mass, we multiply the fraction of each isotope by the mass number , then add them together.
This is more like weighted average, as shown below:
average atomic mass=(mass number of first isotope*fraction)+(mass number of second isotope*fraction)
average atomic mass=(6X*7.59%)+(7X*92.41%)
average atomic mass= 6.92X
Find out more about average atomic mass on:brainly.com/question/13299770
#SPJ1
Answer:
a) 150 pounds
b) 6.75
c) 156.25
d) 0.177
Step-by-step explanation:
We are given the following information in the question:
Mean, μ = 150 pounds
Standard Deviation, σ = 27 pounds
We are given that the distribution of weight of persons on campus is a bell shaped distribution that is a normal distribution.
a) expected value of the sample mean of their weights
![\bar{x} = \mu = 150\text{ pounds}](https://tex.z-dn.net/?f=%5Cbar%7Bx%7D%20%3D%20%5Cmu%20%3D%20150%5Ctext%7B%20pounds%7D)
b) standard deviation of the sampling distribution
![\dfrac{\sigma}{\sqrt{n}} = \dfrac{27}{\sqrt{16}} = 6.75](https://tex.z-dn.net/?f=%5Cdfrac%7B%5Csigma%7D%7B%5Csqrt%7Bn%7D%7D%20%3D%20%5Cdfrac%7B27%7D%7B%5Csqrt%7B16%7D%7D%20%3D%206.75)
c) average weight for these 16 people will result in the total weight exceeding the weight limit of 2500 points
![\dfrac{\text{Limit}}{\text{Number of people}} = \dfrac{2500}{16} = 156.25](https://tex.z-dn.net/?f=%5Cdfrac%7B%5Ctext%7BLimit%7D%7D%7B%5Ctext%7BNumber%20of%20people%7D%7D%20%3D%20%5Cdfrac%7B2500%7D%7B16%7D%20%3D%20156.25)
d) P(sample of 16 persons on the elevator will exceed the weight limit)
Formula:
P(x > 156.25)
Calculation the value from standard normal z table, we have,
![P(x > 610) = 1 - 0.823 = 0.177 = 17.7\%](https://tex.z-dn.net/?f=P%28x%20%3E%20610%29%20%3D%201%20-%200.823%20%3D%200.177%20%3D%2017.7%5C%25)
0.177 is the probability that a random sample of 16 persons on the elevator will exceed the weight limit.
Answer:
![ED=32\ units](https://tex.z-dn.net/?f=ED%3D32%5C%20units)
Step-by-step explanation:
we know that
Applying the Intersecting Secant Theorem
![AC*BC=EC*DC](https://tex.z-dn.net/?f=AC%2ABC%3DEC%2ADC)
substitute the values
![(16+5)*(5)=(ED+3)*(3)](https://tex.z-dn.net/?f=%2816%2B5%29%2A%285%29%3D%28ED%2B3%29%2A%283%29)
Solve for ED
![(21)*(5)=(ED+3)*(3)](https://tex.z-dn.net/?f=%2821%29%2A%285%29%3D%28ED%2B3%29%2A%283%29)
![35=(ED+3)](https://tex.z-dn.net/?f=35%3D%28ED%2B3%29)
![ED=35-3=32\ units](https://tex.z-dn.net/?f=ED%3D35-3%3D32%5C%20units)