Postal service states that at least 64% of all filers delivered by mail is read by the recipient . An environmental group, concerned about waste production, wants to test this assertion. They take a sample of 250 households and find that only 58.7% read filers delivered by mail. Test at the 5% level the null hypothesis that at least 64% of all recipients filers read it against the alternative that the population proportion I less than 64%