Assume that iq scores are normally distributed, with a standard deviation of 11 points and a mean of 100 points.
if 85 people are chosen at random, what is the probability that the sample mean of iq scores will not differ from the population mean by more than 2 points?

Our required probability is 0.91.

Step-by-step explanation:

Since we have given that

n = 85

mean = 100 points

standard deviation = 11

We need to find the probability that the sample mean will not differ from the population mean by more than 2 points.

so, it becomes,

Hence, our required probability is 0.91.

distance covered by pamela in 9 l of fuel = 99km

let us apply unitary method here.

distance covered by pamela in 1 l of fuel =99/9 =11 km

now let us find distance covered by pamela if she has 12 l of fuel.

distance covered in 12 l = distance covered in 1 l of fuel * 12

we know that distance covered by here in 1 l is 11 km.

so distance covered in 12 l of fuel = 11*12 = 132 km.