Real-Life Scenarios
Text Version
(Introduction music)
Image description: Andrew, Khalid and Justyce are in a classroom sitting together at a table. Two types of graphs are shown on the table, the Plinko data and the President’s Ages at Inauguration.
Andrew Wow, how can our Plinko game and presidential ages at inauguration make such similar graphs? How can this be?
Justyce: Oh! You made a normal curve!
Khalid: Justyce, what is a normal curve?
Justyce: A normal curve is a type of density curve. It is a symmetric, single-peaked and bell-shaped curve. When you look at the distribution for a large population or a large amount of data, you often get a normal curve.
Image description: As Justice speaks, a close-up of the Presidential Ages at Inauguration graph appears: This bar graph displays the frequency of the presidents’ ages at inauguration. The horizontal axis is labeled ‘Presidents’ Ages at Inauguration’, and extends from 36 to 76. The vertical axis is labeled ‘Frequency’ and extends from 0 to 10. The first bar covers the age range 42 to 44 years and has a frequency of 2. The next bar covers the range of 46 to 48 years and has a frequency of 4. The next bar covers the range 48 to 50 years and has a frequency of 3. The next bar covers the range 50 to 52 years and has a frequency of 6. The next bar covers the range 52 to 54 years and has a frequency of 2. The next bar covers the range 54 to 56 years and has a frequency of 9. The next bar covers the range 56 to 58 years and has a frequency of 7. The next bar covers the range 58 to 60 years and has a frequency of 1. The next bar covers the range 60 to 62 years and has a frequency of 4. The next bar covers the range 62 to 64 years and has a frequency of 1. The next bar covers the range 64 to 66 years and has a frequency of 3. The last bar covers the range 68 to 70 years and has a frequency of 2. Justyce draws a bell-shaped curve around the data to illustrate a normal curve.