standard deviation

Question 1

standard deviation equation

Answer 1

sd= square root Σ (x-mean)squared / n-1

x= observation
Σ = sum off
n= sample size

Question 2

The ear lengths of a population of rabbits was measured.Ear lengths (mm): 62, 60, 59, 61, 60, 58, 59, 60, 57, 56, 59, 58, 60, 59, 57Calculate the mean and standard deviation.

Answer 2

Step 1: Calculate the mean

Mean = 885 ÷ 15 = 59 mm

Step 2: Find the difference between each value and the mean

Subtract the mean from each value to find the difference

Example: 62 - 59 = 3

Step 3: Square each difference

Square the difference for each value

Example: 32 = 9

Step 4: Total the differences

Step 5: Divide the total by (n-1) to get value A

36 ÷ (15 - 1) = 36 ÷ 14 = 2.571

Step 6: Get the square root of value A