The number of orders received by food delivery app for 7 consecutive days is as follows.
16, 20, 40, 50, 30, 60, 40, 80.
Find the standard deviation about the mean.
19.73
Let's find the mean first = 16+20+40+50+30+60+40+808
¯x = 42
xi1620404830604080deviation26222−612−182−38square of deviation67648443614432441444
∴ Variance=(∑8i=1(xi−¯x)28)
σ2=676+484+4+36+144+324+4+14448
=31168=389.5
Standard deviation = σ=√(∑8i=1(xi−¯x)28))
= √389.5
= 19.73
So, Standard deviation = 19.73