Students at a major university in Southern California are complaining about a serious housing crunch. Many of the university's students, they complain, have to commute too far to school because there is not enough housing near campus. The university officials' response is to perform a study. The study, reported in the school newspaper, contains the following histogram summarizing the commute distances for a sample of 100  students at the university:

commute distance in miles:                   Frequency:

0-4                                                              26

4-8                                                              26

8-12                                                            19

12-16                                                          13

16-20                                                          11

20-24                                                           5

Based on the histogram, find the proportion of commute distances in the sample that are at least 16 miles. Write your answer as a decimal, and do not round your answer.