I need help! Please answer all!

1. 1/9 +2/9=

2. 1/5+2/5+2/5=

3. 5/6-2/6=

3.17 scores on stats final. below are final exam scores of 20 introductory statistics students. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 57, 66, 69, 71, 72, 73, 74, 77, 78, 78, 79, 79, 81, 81, 82, 83, 83, 88, 89, 94 (a) the mean score is 77.7 points. with a standard deviation of 8.44 points. use this information to determine if the scores approximately follow the 68-95-99.7% rule. (b) do these data appear to follow a normal distribution? explain your reasoning using the graphs provided below.

Once george got to know adam, they found that they really liked each other. this is an example of what factor in friendship

Calculate the effective quarterly compound interest rate equivalent to a 1% of monthly compound interest rate.