Express all the trigonometry ratio of cot a​

Iq scores for adults age 20 to 34 years are normally distributed according to n(120, 20). in what range does the middle 68% of people in this group score on the test?

An ulcer medication has 300 milligrams in 2 tablets. how many milligrams are in 3 tablets?

When you have 25 numbers, and jake picks 3 random numbers and puts them back, what is the chance bob has of picking those 3 numbers when he picks 6 random numbers (without putting them back)? explain.