Here is a distribution of six observations, sorted in ascending order:
5.7, 10.2, 11.9, 13.3, 17.6, 19.3
The mean of this distribution is 13. What is the value of (picture)?

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years

Mr. vector door is buying two new cowboy hats all together the hats cost $75.12 the second heart cost twice as much as the first hat what is the price of the more expensive at round to the nearest hundredth

The number of students who ride a school bus is 110% of the number of students who walk. how many students ride the school bus?