Average mark

Calculate average mark in English, if a student got a couple of 3's, 20% less 2 than 3, and 50% more 1's than the 2's.

Correct result:

p =  1.9333

Solution:

p=3⋅x+2⋅0.8x+1⋅1.5⋅0.8xx+0.8x+1.5⋅0.8x=3⋅1+2⋅0.8+1⋅1.5⋅0.81+0.8+1.5⋅0.8=1.9333

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