In the

In the 6th class, the average half-year mark in physics was 1.7. At the end of the year, Maťo improved his mark from 2 to 1, Ivanka from 3 to 2 and Elenka from 4 to 2. Pavlík worsened his mark from 3 to 4. The average mark of the whole class thus improved by 0.1. Most how many children in this class could have a physics mark one (the best) at the end of the year?

Correct result:

n =  30
a =  12

Solution:

p1=1.7 p2=p10.1=1.70.1=85=135=1.6   n p1=p2 n+(21)+(32)+(42)+(34) n 1.7=1.6 n+(21)+(32)+(42)+(34)  0.1n=3  n=30
  p2 n=a 1+(na) 2 1.6 30=a 1+(30a) 2  a=12



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