Statistics Review

Front

What is the total number of students surveyed about their number of brothers and sisters?

Back

15

Front

How do you calculate the mean of a set of numbers?

Back

Add all the numbers together and divide by the total count of numbers.

Front

What is the mean of the following numbers: 2, 9, 10, 6, 8?

Back

7

Front

What does it mean if a temperature falls between 70 degrees and 99 degrees?

Back

It indicates a range of temperatures that can be analyzed for frequency.

Front

How many cities have temperatures between 70 degrees and 99 degrees?

Back

44

Front

What is the third quartile (Q3) in a data set?

Back

It is the value that separates the highest 25% of the data from the rest.

Front

What percentage corresponds to Q3 in a data interpretation?

Back

75%

Front

What is a weighted mean?

Back

It is the average of a set of values, where each value has a different level of importance (weight).

Front

How do you find the weighted mean?

Back

Multiply each value by its weight, sum these products, and then divide by the total of the weights.

Front

What is the weighted mean of the following data set? (Example: 3 with weight 2, 5 with weight 3)

Back

(3*2 + 5*3) / (2 + 3) = 4.2