The purchases made by customers at a convenience store are normally distributed, with a

Question

mean of $5.50 and a standard deviation of $3.50. What is the probability that a randomly chosen
customer makes a purchase between $2.00 and $9.00?

Answer 1

Z1=(2-5.5)/3.5=-1
Z2=(9-5.5)/3.5=+1
Look up the normal distribution table to find P(Z1<Z<Z2)