(a) Find the probability that the sample proportion obtained from the sample of 270 Bank of America customers would be within three percentage points of the population proportion.

step-by-step explanation:

hans did not square the 40-unit side; he merely multiplied it by 2.   incorrect.

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

answer: 486in^2

step-by-step explanation:

      2

  2 is to go somewhat to the top right of a because it is squared    

v= a h/3