A researcher is studying voice frequencies.He is working with a group of male non-native English speakers who are learning English.For this group of speakers, the distribution of fundamental frequencies while speaking English (the frequency of the natural speaking voice) has a mean of 135-Hz and a standard deviation of 14-Hz.The distribution of fundamental frequencies is nearly normally distributed.

FindP₅₁

, which is the frequency separating the lowest 51% fundamental frequency from the higheest 49%.

P₅₁ =-Hz