1. Entry Activity – Calculate the mean
from the frequency table below
Height Frequency
(cm)
0 ≤ h < 10 5
10 ≤ h < 20 6
20 ≤ h < 30 10
30 ≤ h < 40 2
∑
2. Entry Activity – Calculate the mean
from the frequency table below
Height Frequency Mid-point F x MP
(cm)
0 ≤ h < 10 5 5 25
10 ≤ h < 20 6 15 90
20 ≤ h < 30 10 25 250
30 ≤ h < 40 2 35 70
∑ 23 435
∑ (Frequency x Mid-point) ÷ ∑frequency = 435 ÷23 =
18.913034 = 18.9 to 1 d.p.
3. Today I will learn to calculate the
standard deviation from a:
set of data
frequency table
grouped frequency table
Key Words
Mean
Standard deviation
Difference
5. Formulas you need to know
Calculate the standard deviation for the data below:
6, 7, 8, 11, 13, 15
6. Show me how you feel about what we
have just done
7. Today I will learn to calculate the
standard deviation from a:
set of data
frequency table
grouped frequency table
Key Words
Mean
Standard deviation
Difference
8. Formulas you need to know
Calculate the standard deviation for the data below:
Shoe size 4 5 6 7 8
Frequency 3 6 9 3 1
9. Show me how you feel about what we
have just done
10. Today I will learn to calculate the
standard deviation from a:
set of data
frequency table
grouped frequency table
Key Words
Mean
Standard deviation
Difference
11. Formulas you need to know
Calculate the standard deviation for the data below:
Weight 0 ≤ w < 50 50 ≤ w < 100 100 ≤ w < 150 150 ≤ w < 200 200 ≤ w < 250
Frequency 6 5 4 3 6
12. Show me how you feel about what we
have just done
13. Today I will learn to calculate the
standard deviation from a:
set of data
frequency table
grouped frequency table
Key Words
Mean
Standard deviation
Difference
14. Work for today
1) Calculate the standard deviation for the data below:
10, 11, 14, 20, 35, 90
2) Calculate the standard deviation for the data in the table
below:
Detentions 0 1 2 3
Frequency 50 14 6 3
3) Calculate the standard deviation for the data in the table
below:
Height 0 ≤ h < 500 500 ≤ h < 1000 ≤ h< 1500 ≤ h <
(cm) 1000 1500 2000
Frequency 6 5 8 4
15. Show me how you feel about what we
have just done
16. Today I will learn to calculate the
standard deviation from a:
set of data
frequency table
grouped frequency table
Key Words
Mean
Standard deviation
Difference
