Ch. 2 Lesson 2.1

Consider the following frequency table representing the distribution of the cost to a pizza parlor of additional toppings on a pizza (in dollars). Determine the midpoint for the second class.

Step 1. 0.38 + 0.46 = 0.84 Step 2: 0.84/2 = 0.42 Answer: 0.42

Consider the following frequency table representing the distribution of the cost to a pizza parlor of additional toppings on a pizza (in dollars). Determine the midpoint for the second class.

Step 1. 0.42 + 0.49 = 0.91 Step 2: 0.91/2 = 0.455 Answer: 0.455

Consider the following frequency table representing the scores on a test. Determine the upper class boundary for the fourth class.

Step 1. 119 + 120 = 239 Step 2. 239/2 = 119.5 Answer: 119.5

Consider the following frequency table representing the distribution of hours students spend on homework in a week. Determine the midpoint for the third class.

Step 1. 16 + 22 = 38 Step 2. 38/2 = 19 Answer= 19

Consider the following frequency table representing the distribution of hours students watch tv in a week. Determine the lower class boundary for the second class

Step 1. 18 + 19 = 37 Step 2. 37/2 = 18.5 Answer: 18.5

Consider the following frequency table representing the distribution of hours students spend on homework in a week. Determine the midpoint for the fourth class.

Step 1. 23 + 29 = 52 Step 2. 52/2 = 26 Answer: 26

Consider the following frequency table representing the scores on a test. Choose the interval that contains the score, 73.8

Looking at the table, the score, 73.8, is within the class limits of 72 and 82. Therefore, the answer is 72-82.

how to find class width

subtract the lower limit of one class from the lower limit of the next class

how to find lower class boundary

add the upper limit of one class to the lower limit of the next class and divide by two

how to find upper class boundary

add the upper limit of one class to the lower limit of the next class and divide by two

How do you find relative frequency?

frequency/total

Consider the following frequency table representing the distribution of the cost to a pizza parlor of additional toppings on a pizza (in dollars) Determine the relative frequency for the third class as a simplified fraction.

Step 1. 4+5+11+10+14=44 Step 2. 11/44 Step 3. Simplify 1/4

how to find cumulative frequency

add each sum of preceding frequencies

Consider the following frequency table representing the distribution of cost of a paperback book (in dollars). Determine the cumulative frequency for the fourth class.

14+5+8+9=36

Consider the following frequency table representing the scores on a test. Determine the lower class boundary for the second class.

Step 1. 59 + 60 = 119 Step 2. 119/2 = 59.5 Answer: 59.5

Consider the following frequency table representing the distribution of hours students watch tv in a week. Determine the relative frequency for the third class as a simplified fraction.

4+12+7+7+7=37 Answer: 7/37

Consider the following frequency table representing the distribution of hours students spend on the internet in a week. Determine the upper class boundary for the second class.

Step 1. 34 + 35 = 69 Step 2. 69/2 = 34.5 Answer: 34.5

Consider the following frequency table representing the scores on a test. Determine the number of scores between 49.5 and 93.5

14+8+12+6=40

How do you determine the midpoint?

Add the lower limit to the upper limit then divide by 2

Consider the following frequency table representing the distribution of the cost to a pizza parlor of additional toppings on a pizza (in dollars) Determine the relative frequency for the fourth class as a simplified fraction.

Step 1. 4+5+11+10+14=44 Step 2. 10/44 Step 3. Simplify 5/22

Consider the following frequency table representing the scores on a test. Determine the class width of each class.

72−64=8

Consider the following frequency table representing the distribution of hours students watch tv in a week. Determine the relative frequency for the fourth class as a simplified fraction.

4+12+7+7+7=37 Answer: 7/37

Consider the following frequency table representing the distribution of hours students watch tv in a week. Determine the cumulative frequency for the third class.

4+2+10=16

Consider the following frequency table representing the distribution of cost of a paperback book (in dollars). Determine the cumulative frequency for the second class.

14+5=19