Aset of data is normally distributed with a mean of 64 and a standard deviation of 2.5. what percent of the data is in the interval 64-66.5?

34.13%

Step-by-step explanation:

We know that the mean is:

And the standard deviation is:

The probability that a randomly selected X data is between 64 and 66.5 is:

Now we calculate the Z-score

For X = 64 the Z-score is:

For X = 66.5 the Z-score is:

Looking in the normal table we have to:

The percentage is:

option c) graph of line going through 1, 4 and 3, 10

step-by-step explanation:

let y equal to margo's coin collection

let x equal to number of years

at the begining x=0, y=1 → point=(x,y)→point=(0,1)

she adds 3 coins per year, then y=1+3x

at x=1, y=1+3(1)=1+3→y=4→point=(x,y)→point=(1,4)

at x=3, y=1+3(3)=1+9→y=10→point=(x,y)→point=(3,10)

the graph of line going through (1, 4) and (3, 10), then the option c is the correct.