# Workshop 16,17,18

Starter
Find the mean of 7,8,9,6

1 / 21
Slide 1: Slide

This lesson contains 21 slides, with interactive quizzes and text slides.

Lesson duration is: 45 min

## Items in this lesson

Starter
Find the mean of 7,8,9,6

#### Slide 1 -Slide

Workshop 16,17,18
Pages 34-39

#### Slide 2 -Slide

By the end of the lesson you will be able to
1. Calculate the average of a group of numbers
2. Compute the elapsed time

#### Slide 3 -Slide

Facts
Finding the Average The average, or mean, is a single number used to
represent a group of numbers. The average of two or more numbers is the
sum of the numbers divided by the number of items added.

#### Slide 4 -Slide

Find the average of 7, 9, 4, 6, and 4.

#### Slide 5 -Open question

Find the average of 5.7, 6.3, 4.2, 5.8, and 3.4.
A
5.0
B
5.08
C
2.54
D
5.06

#### Slide 6 -Quiz

Find the average of 31.7, 33.9, 36.1, 33.8 (nearest tenth)

#### Slide 7 -Open question

Rachel Kelley’s tips from being a bellhop were $4.00,$2.00, $3.50,$1.00,
$4.00,$2.00, $1.00, and$3.00. What was her average tip?
A
2.58
B
2.59
C
2.56
D
2.54

#### Slide 8 -Quiz

Find the elapsed time for someone who worked from:
a. 2:15 PM to 10:30 PM
10.30-2.15= 8.15
8 hours, 15 minutes

#### Slide 9 -Slide

Important facts
You cannot subtract 45 minutes from 30 minutes unless you borrow an hour and add it to the 30 minutes. Remember that 1 hour = 60 minutes.

#### Slide 10 -Slide

Find the elapsed time
8:45 am to 12:30 pm
12.30 can be written as 11.30+.60=11.90
11.90-8.45=3 hrs 45 mts

#### Slide 11 -Slide

Find the elapsed time of 2:50 pm to 10:20 pm

#### Slide 12 -Open question

Important fact
To find elapsed time when the time period spans 1:00 o’clock, add 12 hours to the later time before subtracting

#### Slide 13 -Slide

Find the elapsed time from 10:20 AM to 3:30 PM
3.30     =(12+3)+.30= 15.30
-10.20=-10.20            =-10.20
5 :10 or 5 hrs 10 min

#### Slide 14 -Slide

Find elapsed time for 8:30 am to 4:30 pm
A
8 hr 20 min
B
8 hr 15 min
C
8 hr 0min
D
8 hr 14 min

#### Slide 15 -Quiz

Find the cost to ship each package to the indicated Rate Group in Figure W18.1.
1 lb, Rate Group 1
10 lb, Rate Group 6

#### Slide 16 -Slide

Find cost to ship for 6 lb, Rate Group 5

#### Slide 17 -Open question

Find the cost to ship 9.75 lb, Rate Group 6
A
96.75
B
29
C
131.05
D
47.50

#### Slide 18 -Quiz

Find the mean of 4.37, 3.74, 4.90, 5.74 (nearest hundredth)

#### Slide 19 -Open question

Find the elapsed time 9:25 pm to 6:15 am

#### Slide 20 -Open question

What are the important facts of the lesson?