Answer: 0.7471
Step-by-step explanation:
Given : The Intelligence Quotient (IQ) test scores for adults are normally distributed with a population mean of 
and a population standard deviation of 
.
Sample size = 50
Using formula 
, the z-value corresponding to x=98 will be:-
Z-value corresponding to x=103 will be:-
Using the standard normal distribution table for z-scores, we have
P-value = 
Hence, the probability we could select a sample of 50 adults and find that the mean of this sample is between 98 and 103 = 0.7471
Ok so to be a solution of both, it mus satisfy both equations
therefor only the first choice is correct because (the following is why the other answers are wrong)
2. solutions can lie on axises
3. it mus satisfy both equations
4. it can lie on or between the axises
answer should be the fist one
Step 1. 16x^2 + 20x - 12x -15
step 2. 4x(4x + 5) - 3 (4x + 5)
step 3. (4x + 5)(4x - 3)
Answer: (4x + 5)(4x - 3)
hope i helped^-^
