Finding Mid Range, Standard Deviation and Variance

Monthly sales figures for a store are as follows:

Jan $62k Feb $71k Mar $68k Apr $47k
May $71k Jun $69k Jul $80k Aug $75k
Sept $87k Oct $77k Nov $63k Dec $70k

Find the:
a.Mid-range
b.Standard Variance
c.Standard Deviation

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...e
Minimum sales=47 K
Maximum sales=87 K
Mid range=(47+87)/2=67 K

b. Standard Variance
Mean= ...