Answer:
The 95% confidence interval is
Step-by-step explanation:
From the question we are told that
The population standard deviation is
The sample size is n = 20
The sample mean is
From the question we are told the confidence level is 95% , hence the level of significance is
=>
Generally from the normal distribution table the critical value of is
Generally the margin of error is mathematically represented as
=>
=>
Generally 95% confidence interval is mathematically represented as
=>
=>
<h3>
Answer:</h3>
<h3>
Step-by-step explanation:</h3>
The numerator can be found by multiplying each of these fractions by 100. It can be helpful to reduce these fractions first.
Here, we calculate those numerators.
a) 15/60 · 100 = 1/4 · 100 = 100/4 = 25
b) 30/60 · 100 = 1/2 · 100 = 100/2 = 50
c) 25/75 · 100 = 1/3 · 100 = 100/3 = 33 1/3
Of course, the denominator is 100, so the fractions are ...
... 15/60 = 25/100
... 30/60 = 50/100
... 25/75 = (33 1/3)/100
_____
<em>Comment on this solution</em>
Effectively, we have multiplied each fraction by 1 = 100/100. That is ...
... fraction × (100/100) = (fraction × 100)/100
This changes the form, but not the value.
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:
2 Tons Wood
Step-by-step explanation:
According To Question,
Given,the ratio of the weight of wood to the weight of raw materials used by a factory is 16 : 56 or 2 : 7 .
And, Factory were to use 7 tons of raw materials .
Thus, if 56 ⇒⇒ 7Tons of Raw Material
So,
16⇒⇒2 Tons of Wood Material .