The weight ofa product is normally distributed with the mean 5 ounces. A randomly chosen unit of this product weighs 7.1 ounces. The probability of the unit weighing more than 7.1 ounces is .0014. The production supervisor has lost files containing different pieces of infomation about this process including the standard deviation. Find out the value of standard deviation for this process.
Answers are:
A- 1.67
B-0.70
C-2.10
D-0.50