1. A professor at a loca community noted that the grades of hi s students were normally distrubuted with a mean of 74 and a standard deviation of 10.The prof has informed us that 6.3 percent of his...

1. A professor at a loca community noted that the grades of hi s students were normally distrubuted with a mean of 74 and a standard deviation of 10.The prof has informed us that 6.3 percent of his students received A's while only 2.5 percent of his students failed the course and received F's. a. what is the minimum score needed to make an A.

b. what is the minimum scoreamong those who received an F.

C. If tere were 5 students who did not pass the course,how many students took the course.

2.The Global fisherypacks shrimps that weigh more than 1.91 ounces each in packages marked 'large"and the shrimp that weigh less than 0.47 ounces each into packages marked "small", the remainer are packed in "medium size packages. if a day's catch showed that 19.77 percent of the shrimps were large and 6.06 percent were small, determine themean and standard deviation for the shrimp weights. Assume that the shrimps' weight are normally distrubuted.