On a straight stretch of highway, a food exit lies one-fifth of the way between Exit 158 and Exit 178, where the exit numbers correspond to the location in miles along the highway. What is the exit number for the food exit?

Mahnoor randomly selects times to walk into a local restaurant and observe the type of music being played she found that the restaurant was playing country 11 times rock & roll 17 times and blues 8 times use the observed frequencies to create a probability model for the type of music the restaurant is playing the next time mahnoor walks in.