Question

Jen's monthly phone bill is normally distributed with a mean of $55 and a standard deviation of $8. In what interval would you expect the central 95% of bills to be found?
A) 47 - 63
B) 39 - 71
C) 31 - 79
D) 23 - 87

Answer 1

B) 39 - 71
Apply empirical rule 95% is within 2 standard deviations.