A set of elementary school student heights are normally distributed with a mean of 105 centimeters and a standard deviation of 10 centimeters. Faisal is an elementary school student with a height of 103.1 centimeters. What proportion of student heights are lower than Faisal's height?

b

step-by-step explanation:

the word superfluous means unnecessary

yes the total will be same because in both of them the expression.is rearranged but their sign remains the same hence it hss just been shuffled

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,