The mean of a normal distribution is the average of the first ten natural numbers. then what is the probability of variable between 4 and 7, if \(\rm P\left( {x \le 4} \right) = \frac{1}{5}\)
1
\(\frac{4}{5}\)
2
\(\frac{2}{5}\)
3
\(\frac{9}{10}\)
4
\(\frac{3}{5}\)