Does it seem reasonable to say that the square root of 8 is approximately 2 why or why not

Ineed to know the answer right now! !

If the value of cos330°is√3/2 then find cos 165°.

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.