Answer:
The approximate probability is 
Step-by-step explanation:
From the question we are told that
The population proportion of Americans that say the average person is not considerate of others when talking on a cellphone is p = 0.51
The sample size is n = 100
Generally because the sample size is sufficiently large the mean of this sampling distribution is

Generally the standard deviation is mathematically represented as

=> 
=> 
Generally the sample proportion is mathematically represented as

=> 
Generally the probability that 52 or more Americans would indicate that the average person is not very considerate of others when talking on a cellphone is mathematically represented as


=> 
From the z table the area under the normal curve corresponding to 0.2 to the right is

i think there is a trick so the 3 nbs are 9+11+13=33
How's that we need 30
if we flip 9 we get 6
so the answer would be 6+11+13=30
Is it just x=b-cd
If so
cd=b-x
÷d. ÷d
C=b-x/d