Final exam

At the final exam, the student answers from three areas, which are evaluated in a ratio of 1: 2: 2. What grade will John receive if he answered as follows: 3,1,2.

Correct answer:

x =  2

Step-by-step explanation:

$$\begin{gathered} x_0=3\cdot {\displaystyle \frac{1}{1+2+2}}+1\cdot {\displaystyle \frac{2}{1+2+2}}+2\cdot {\displaystyle \frac{2}{1+2+2}}={\displaystyle \frac{9}{5}}=1\frac{4}{5}=1.8 \\ x=[x_0]=[1.8]=2 \end{gathered}$$

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