Plz helpp. In a high school with 5,000 students, the number of text messages sent by each student during a particular month was recorded. The mean number of text messages sent during the month was 55 per student.

If the data was normally distributed, and if the standard deviation of the data was 4 text messages, which of these is the BEST estimate for the number of students who sent fewer than 51 text messages during the month?

A) 800

B) 1,200

C) 1,600

D) 1,700
p. s i already did it and its a)800