Finding z-scores (High School Algebra 2)

Question

A normal distribution has a mean of 50 and a standard deviation of 5.

P(43≤x≤57)

z-score: ?

Help please.

Answer 1

Z = (x-μ)/σ

x=observed value

μ=sample mean

σ=standard deviation

(47-50)/5 = -0.60

(43-50)/5= -1.40