PS_6.2.1 Video lesson - Expected Value and StDev of Random Var

• Discrete random variable values

• Number of occurrences

• Standard deviation

• Probability of each event

• 14.4
• 18.6
• 10.2
• 12.5

What's another way of describing the mean for a set of data?

• How far apart the values are

• How many events were measured

• The typical value

• The chance of success

• 14.4

• 34.1
• 50.2
• 76.8

Here I just copied and pasted the variance equation into a square root in Desmos. This allowed me to keep ALL of the decimal place that may be hidden in my final answer of 76.8.

What is the standard deviation of our data set?

• 7.5
• 9.2
• 10.1
• 8.8

What does the standard deviation tell us about our data?

• The standard deviation shows the maximum value in the dataset.
• The standard deviation tells us how much the data varies from the mean.
• The standard deviation measures the total number of data points.
• The standard deviation indicates the average value of the data.

Which calculation is used to find the "Expected Value"?

• mean

• standard deviation

• 1 - (sum of probabilities)

• variance