The time to complete a standardized exam in the byu-idaho testing center is approximately normal with a mean of 70 minutes and a standard deviation of 10 minutes. using the 68-95-99.7 rule, approximately what percentage of students will complete the exam in under fifty minutes? give your answer accurate to one decimal place.

answer: 94

step-by-step explanation: 79+91+92+94+94 = 450 divided by 5 (since there are 5 number that are being added) = 90

use distributive property on all like terms and change your signs if you have a double negative or if you have positive/negative

statement #3: proof- ang is congruent to ang ecd : angles are congruent.  

step-by-step explanation:

1: the missing angles in statement #3  

a.) acb  

reason- the reason why the answer is acb is because angle ecd and angle acb are both the same size *that's what the word congruent means this is really simple.  

2: the missing word in reason #3  

c.) vertical  

reason- the reason why the answer is vertical is because the angles in that diagram on figure 2 is slanted, which is vertical, and the e and a both lay on vertical lines. along with the other's, but e and a are the 2 main points you want to focus on. and c is kind of like your starting point, because c is for both angles, not just one.  

i hope that was and understanding.