The following data represent the discrete probability distribution for the number of stars that reviewers gave a first edition statistics reference book. 

Stars               5       4       3       2       1 

Probability   25%  35% 20% 10% 10% 

The second edition of this reference book has been released and a random sample of people that have purchased the book has been collected with the following results. 

Stars                 5    4    3   2   1 

Frequency     23   18   8   2    9 

The publisher would like to know if the probability distribution for reviews has changed from the first edition to the second edition using α = 0.05. The expected frequency of one-star reviews is ________.