Question

Marks on an anatomy assignment follow a normal distribution with a mean of 65 and a standard deviation of 12. Approximately what percentage of the students have scores below 50?

Select one:

a. 39%

b. 11%

c. 18%

d. 15%

e. 89%

Answer 1

Solution :

Given that,

mean = = 65

standard deviation = = 12

P(X< 50) = P[(X- ) / < (50-65) / 12]

= P(z < -1.25)

Using z table

= 0.1056

answer=11%