AST Data Analysis and Statistics 2

Question 1

A data set has values: 4, 8, 6, 10, 12. What is the mean?

Accepted Answer

8

Answer

(4 + 8 + 6 + 10 + 12) / 5 = 40 / 5 = 8.

Question 2

In a normal distribution, approximately what percentage of data falls within one standard deviation of the mean?

Accepted Answer

68%

Answer

The empirical rule states approximately 68% of data falls within ±1 standard deviation.

Question 3

If a bar chart shows sales of $200, $350, $150, and $300 for four quarters, what were the total annual sales?

Accepted Answer

$1,000

Answer

200 + 350 + 150 + 300 = $1,000.

Question 4

A pie chart shows 40% for category A, 35% for B, and the rest for C. What percentage is C?

Accepted Answer

25%

Answer

100% - 40% - 35% = 25%.

Question 5

In a data set of 9 numbers sorted in ascending order, which position is the median?

Accepted Answer

5th

Answer

For n = 9, the median is at position (9+1)/2 = 5th.

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