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

4. The normal curve

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