10/2 is an improper fraction. So, change it to a mixed number. 10÷2=5
5 is the mixed number and is the equivalent fraction. You can also do 5/1 which is also equivalent.
Answer: 0.2643
Step-by-step explanation:
Let p be the population proportion and
be the sample proportion .
As per given question , we have

z-score : 

The required probability ( using z-table ):-

Hence, the probability that the proportion of books checked out in a sample of 478 books would be less than 13% = 0.2643