Find the probability that based on the normal distribution.
The weight of items produced by a machine is normally distributed with a mean of 8 ounces and a standard deviation of 2 ounces.
What percentage of items will weigh between 6.4 and 8.9 ounces?
a) 0.1145
b) 0.2881
c) 0.1736
d) 0.4617