Matty’s piano book includes 15 songs in the key of c, 10 in the key of g, and 5 in the key of f. the songs from all three keys appear in random order. over the past month, matty has randomly opened his piano book to a song in the key of c 80 times, the key of g 30 times, and the key of f 10 times. what are the theoretical and experimental probabilities that the next song matty randomly picks will be in the key of g?

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According to a study conducted in 2015, 18% of shoppers said that they prefer to buy generic instead of name-brand products. suppose that in a recent sample of 1500 shoppers, 315 stated that they prefer to buy generic instead of name-brand products. at a 5% significance level, can you conclude that the proportion of all shoppers who currently prefer to buy generic instead of name-brand products is higher than .18? use both the p-value and the critical-value approaches.

If mary had 320 toy cars and she gave her friend 50 cars and then she gave her brother 72 more cars how much toy cars would mary have left ● explain with proper details