Answer:
a
b
Step-by-step explanation:
From the question we are told that
The data is 87 91 86 82 72 91 60 77 80 79 83 96
Generally the point estimate for the mean is mathematically represented as
=> 
=>
Generally the point estimate for the standard deviation is mathematically represented as
=> 
=>
The answer is 65° because 115° and another number has to add up to 180°
Answer:
Choice A.
Step-by-step explanation:
Use graphing calculator
Answer:
b because if your going to the left that means is negative and we are going up that means it's positive
For every 3 girls, there are 4 boys. if there are nine girls, that expands to three extra boys, because for every three theres an extra one. so there are 12 boys (9+3.) the final ratio, boys to girls, is 12:9.
