you invested $5000 between two accounts paying 3% and 6% annual interest, respectively. If the total interest earned for the year was $480, how much was invested at each rate

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.