Find the area under the standard normal curve to the left of

Find the area under the standard normal curve to the left of z = 2.63

Solution

we need to find a value of z = 2.63 in our tables but as this z is positve we will find a value for the area upper 2.63

so we just need to do a subctract

the value of probability for z = 2.63 is 0.00427

so the area under the standard normal curve to the left of z = 2.63 is 1 - 0.00427 = 0.99573