Joe purchased a tetrahedral die (triangular shaped) with four (4) sides at a yard sale. Joe thought the "dude" he purchased it from appeared "shifty" so he tested it to see whether it was fair. He got the following outcomes. Perform a Chi-square Goodness of fit test at the .05 (5%) significance level (?) to answer the following questions.

Scores Frequency (x) (fo) 15 2 19 3 27 4 19