2 The lengths of the tails of adult raccoons of a certain species are normally distributed with mean 28 cm and standard deviation 3.3 cm .
- Find the probability that a randomly chosen adult raccoon of this species has a tail length between 23 cm and 35 cm .
The masses of adult raccoons of this species are normally distributed with mean 8.5 kg and standard deviation \(\sigma \mathrm { kg } .75 \%\) of adult raccoons of this species have mass greater than 7.6 kg . - Find the value of \(\sigma\).