You have a normal distribution of hours per week that music students practice. The mean of the values is 8 and the standard deviation of the values is 4.

According to the normal distribution, 50% of the music students practice between 5.3 to 10.7 hours each week.

What percentage of students study less than 5.3 hours each week?

A. 12.5%

B. 20%

C. 50%

D. 25%

A step by step explanation would be highly appreciated.