A distribution is bell-shaped, with a mean of 170 and a standard deviation of 25. Using the empirical rule,   a. What percentage of observations are between 120 and 195?  b. What percentage of observations are greater than 245? 

Events that do not share any common outcome of an experiment are  

A major consequence of the War of 1812 was it:

Lincoln’s Gettysburg Address:

Consider the following equation: Cu(s) + 2 HBr(aq) → CuBr2(aq) + H2(g) A 25.0 mL solution of 1.5 M HBr that completely reacts with copper metal will produce _______ moles of CuBr2.

A university president claims more than 55% of all students regularly use the campus library. A random sample of 250 students yielded 141 who regularly use the library. Use a 5% level of significance to test the researcher’s claim.   State the hypotheses:

Based off the boxplot above, a. The value of the IQR is . b. The lower bound (LB) value for determining outliers is .

A university president claims more than 55% of all students regularly use the campus library. A random sample of 250 students yielded 141 who regularly use the library. Use a 5% level of significance to test the researcher’s claim.   Calculate the p-value using the appropriate table above.

What volume would 12.0 grams of helium occupy at 1.7 atm of pressure and a temperature of 300 K?

A buffer solution contains a mixture of carbonic acid (H2CO3) and potassium hydrogen carbonate (KHCO3). What reaction will take place if H+ is added to this solution?