Arithmetic mean, x̄= ∑fx

n

where:

x̄= Arithmetic mean

∑ = sum of

X = series of figures in a given data

f = nunmber of times a particular number occurs (frequency)

n = number of figures or element

From the question:

Since, x̄= ∑fx

N

Then, x̄= ∑fx

N

=\(\frac{340}{20}\)

= 17