QUIZLET An empirical probability distribution based on weekly study times for a sample of 40 students is provided to the right. Suppose one of those students was chosen randomly. In parts​ (a) through​ (d) below, using your​ distribution, find the probability that the study time in the past week for the student selected would have been in each of the following ranges. (a) 30-39 hours 0.625 ​(Type an integer or a​ decimal.) ​(b) 40-59 hours 3.125 ​(Type an integer or a​ decimal.) ​(c) fewer than 30 hours 4.625 ​(Type an integer or a​ decimal.) ​(d) at least 50 hours nothing ​(Type an integer or a​ decimal.) Class Limits Frequency f Relative Frequency nbsp ​10-19 13 0.325 ​20-29 4 0.100 ​30-39 5 0.125 ​40-49 11 0.275 ​50-59 2 0.050 ​60-69 1 0.025 ​70-79 4 0.100 ​Total: n equals 40