The question is an illustration of arithmetic sequence.
<em>The number of conversation for 19 people is 171</em>
<u />
<u>(a) 9 people</u>
9 represents the number of people
8 represents the number of conversation each person had
2 represents the number of people having a conversation at once (i.e 2 people at once)
<u>(b) 19 people</u>
We have:
The number of conversation is:
So, we have:
Hence, the number of conversation for 19 people is 171
Read more about arithmetic sequence at:
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Simplifying
3x + 7y = 28
Solving
3x + 7y = 28
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-7y' to each side of the equation.
3x + 7y + -7y = 28 + -7y
Combine like terms: 7y + -7y = 0
3x + 0 = 28 + -7y
3x = 28 + -7y
Divide each side by '3'.
x = 9.333333333 + -2.333333333y
Simplifying
x = 9.333333333 + -2.333333333y
According
to the empirical rule, if the data form a "bell-shaped" normal
distribution, approximately 99.7 percent of the observations will be contained
within 3 standard deviations around the mean.
<span>
To add, a bell curve is used to describe the mathematical concept called
normal distribution, sometimes referred to as Gaussian distribution. </span>
Answer:
b no.is the correct answer.