Mathematics, 07.12.2019 16:31 LeilaniCo

Compare the mean and standard deviation of set a and set b.
set a: 7, 3, 4, 9, 2
set b: 5, 8, 7, 6, 4

Answers: 2

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Set A: {7, 3, 4, 9, 2}
Finding the Mean of Set A: $\bar{x} = \frac{7 + 3 + 4 + 9 + 2}{5}$
   $\bar{x} = \frac{25}{5}$
   $\bar{x} = 5$

Finding the Standard of Set A: $\sigma = \sqrt{\frac{(\bar{x} - x_{1})^{2} + (\bar{x} - x_{2})^{2} + (\bar{x} - x_{3})^{2} + (\bar{x} - x_{4})^{2} + (\bar{x} - x_{5})^{2}}{n}}$
   $\sigma = \sqrt{\frac{(5 - 7)^{2} + (5 - 3)^{2} + (5 - 4)^{2} + (5 - 9)^{2} + (5 - 2)^{2}}{5}}$
   $\sigma = \sqrt{\frac{(-2)^{2} + (2)^{2} + (1)^{2} + (-4)^{2} + (3)^{2}}{5}}$
   $\sigma = \sqrt{\frac{4 + 4 + 1 + 16 + 9}{5}}$
   $\sigma = \sqrt{\frac{34}{5}}$
   $\sigma = \sqrt{6.8}$
   $\sigma \approx 2.6$

Finding the Mean of Set B: $\bar{x} = \frac{5 + 8 + 7 + 6 + 4}{5}$
   $\bar{x} = \frac{30}{5}$
   $\bar{x} = 6$

Finding the Standard Deviation of Set B: $\sigma = \sqrt{\frac{(\bar{x} - x_{1})^{2} + (bar{x} - x_{2})^{2} + (\bar{x} - x_{3})^{2} + (\bar{x} - x_{4})^{2} + (\bar{x} - x_{5})}{n}}$
$\sigma = \sqrt{\frac{(6 - 5)^{2} + (6 - 8)^{2} + (6 - 7)^{2} + (6 - 6)^{2} + (6 - 4)^{2}}{5}}$
$\sigma = \sqrt{\frac{(1)^{2} + (-2)^{2} + (-1)^{2} + (0)^{2} + (2)^{2}}{5}}$
$\sigma = \sqrt{\frac{1 + 4 + 1 + 0 + 4}{5}}$
$\sigma = \sqrt{\frac{10}{2}}$
$\sigma = \sqrt{5}$
$\sigma \approx 2.236$

The mean and standard deviation of Sets A and B are different.

Answer from: Quest

In the first triangle 80+20+p=180 (since sum of all angles of a triangle is 180)so p= 80also in second triangle 55+45+q=180 (since sum of all angles of a triangle is 180)so q=80so we can conclude that p=80 degrees q=80 degrees so p=q=80 degreeshence option b is correct
What do you know to be true about the values of p and q?

What do you know to be true about the values of p and q?

Answer from: Quest

answer: 1) twenty-seven times y

2) twenty-seven multiplied by y

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Compare the mean and standard deviation of set a and set b.
set a: 7, 3, 4, 9, 2
set b:...