In a large population of college students, 20% of the students have experienced feelings of math anxiety. if you take a random sample of 10 students from this population, the standard deviation of the number of students in the sample who have experienced math anxiety is:

Hey there!:

The number of students in the sample who have experienced math anxiety is a binomial distribution  

Bin (n , p) where n = 10 and p = 0.2  

The mean of a binomial distribution is np = 2  

The variance is np (1- p) = 1.6 so the standard deviation is √ 1.6 = 1.265  

mean=2; standard deviation= 1.265

Hope this helps!