Exploring Mean, Standard Deviation, and Variance in IB Math

The video tutorial covers key statistics topics, including mean, standard deviation, and variance. It explains how to calculate the mean and discusses the concepts of deviation and variance, focusing on how they represent data spread. The tutorial also explores the effects of adding or multiplying a constant to a data set, highlighting changes in mean and standard deviation. These concepts are linked to common IB math exam questions.

What is the mean of the dataset 1, 2, 3, 4, 5?

• 5

• 2.5

• 4

• 3

What does the standard deviation measure in a dataset?

• Total sum

• Spread of data

• Middle value

• Average value

What is the variance of a dataset if the standard deviation is root 2?

• 4

• root 2

• 1

• 2

If each data point in the set 1, 2, 3, 4, 5 is increased by 10, what is the new mean?

• 5

• 10

• 13

• 15

How does adding a constant to a dataset affect its variance?

• It doubles

• It increases

• It decreases

• It remains unchanged

If the original dataset's mean was 3 and each value is increased by 10, what is the new mean?

• 10

• 30

• 3

• 13

If every term in the dataset is multiplied by 10, what happens to the mean if the original mean was 3?

• 3

• 30

• 13

• 300

What is the new standard deviation if the original was root 2 and each term is multiplied by 10?

• root 2

• 20

• 10 root 2

• 100

What is the new variance when the dataset is multiplied by 10 and the original variance was 2?

• 200

• 2

• 100

• 20

What is the effect of multiplying each term in a dataset by a constant on the standard deviation?

• It is multiplied by the same constant

• It is halved

• It is squared

• It remains the same