Answer: C
Hello,
Step-by-step explanation:
[tex]\overline{x}=50,\ \sigma=3,\ z=\dfrac{x-50}{3} \\\\p(47\leq x \leq 53)=p(\dfrac{47-50}{3} \leq z \leq \dfrac{53-50}{3} )=p(-1\leq z \leq 1)\\\\p(z\leq 1)=0.8413\ (in\ table)\\\\p(z\geq 1)=p(z\leq 1)=1-0.8413=0.1587\\\\p(-1\leq z \leq 1)=0.8413-01587=0.6826\\[/tex]
p≈68%
Answer C
