last year, 70 musicians attended a jazz camp, and 10 of them were pianists. based on last years attendance…
last year, 70 musicians attended a jazz camp, and 10 of them were pianists. based on last years attendance, how many of the next 77 musicians to sign up should you expect to be pianists? pianists
Answer
Explanation:
Step1: Calculate the proportion of pianists last year
The proportion of pianists last year is $\frac{10}{70}=\frac{1}{7}$.
Step2: Predict the number of pianists for the next - group
Multiply the proportion by the number of new musicians. So the expected number of pianists among 77 new musicians is $\frac{1}{7}\times77 = 11$.
Answer:
11