What is the r value of the following data to three decimal places x y 4 23 5 12 8 10 9 9 13 2
1 answer:
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Answer: V(X) = 0.96
Step-by-step explanation: <u>Variance</u> is defined as the average of the squared difference from the sample or population mean.
For a discrete frequency distribution is calculated following the steps:
1) Determine expected value or mean:
E(X) = 1.2
2) Multiply frequency and the squared difference of x and expected value:
3) Add them:
= 1008 + 36 + 384 + 972 = 2400
4) Divide the sum per frequency total:
V(X) = 0.96
The variance of the number of cups of coffee is <u>0.96</u>.
Jeremy's height is 67.2 inches
The diagram below represents situation
<h3>Proportion</h3>Proportion says that two ratios (or fractions) are equal. This a mathematical comparison between numbers.
Therefore, let's establish the proportion in this situation
- Malik height / Malik shadow = Jeremy height / Jeremy shadow
Therefore,
- 72 / 60 = x / 56
cross multiply
72 × 56 = 60x
60x = 4032
divide both sides by 60
x = 4032 / 60
x = 67.2
Therefore, Jeremy's height is 67.2 inches
learn more on proportion here: brainly.com/question/26258657
