Question

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Answer 1

for 50 z1= (50-80)/15=-2
for 95 z2=(95-80)/15=1
the required prob=area under the nurmal curve between z=-2 and z=1

Answer 2

82%

2%

34%

16%

Answer 3

i don't remember the exact area betwen 0 and 2 and the area between 0 and 1
can u check the normal curve in any book and add the area between 0 and 2 and the area between 0 and 1,

may be i guess it may come around 82%...(but plz check it properly)

Answer 4

yup it is 48%+34%=82%

Answer 5

thank you! :)