A study looked at the running times of certain movies released in​ 2005, as shown to the right. The standard deviation of these running times is 18.4 ​minutes, and the quartiles are Upper Q 1 equals99 minutes and Upper Q 3 equals118 minutes. ​a) Describe the spread in running times based on ​i) the quartiles. ​ii) the standard deviation. ​b) Should there be any concerns about using either of these descriptions of​ spread? Explain.

At the olympic games, many events have several rounds of competition. one of these events is the men's 100-meter backstroke. the upper dot plot shows the times (in seconds) of the top 8 finishers in the final round of the 2012 olympics. the lower dot plot shows the times of the same 8 swimmers, but in the semifinal round. which pieces of information can be gathered from these dot plots? (remember that lower swim times are faster.) choose all answers that apply: a: the swimmers had faster times on average in the final round. b: the times in the final round vary noticeably more than the times in the semifinal round. c: none of the above.

Write the pair of fractions as a pair of fractions with a common denominator

If 1.4% of the mass of a human body is calcium, how many kilograms of calcium are there in a 165-pound man? 1.0 kg ca 5.1 kg ca 1.0 x 102 kg ca 5.1 x 102 kg ca