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 answer:

p =  1.9333

Step-by-step explanation:

$p={\displaystyle \frac{3\cdot x+2\cdot 0.8x+1\cdot 1.5\cdot 0.8x}{x+0.8x+1.5\cdot 0.8x}}={\displaystyle \frac{3\cdot 1+2\cdot 0.8+1\cdot 1.5\cdot 0.8}{1+0.8+1.5\cdot 0.8}}=1.9333$

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