At burnt mesa pueblo, archaeological studies have used the method of tree-ring dating in an effort to determine when prehistoric
people lived in the pueblo. wood from several excavations gave a mean of (year) 1250 with a standard deviation of 38 years. the
distribution of dates was more or less mound-shaped and symmetric about the mean. use the empirical rule to estimate the following.
(a) a range of years centered about the mean in which about 68% of the data (tree-ring dates) will be found
between
and .. a. d.
(b) a range of years centered about the mean in which about 95% of the data (tree-ring dates) will be found
between
and
a. d.
(c) a range of years centered about the mean in which almost all the data (tree-ring dates) will be found
between
and
a. d.

steve should create a type of business report called a business plan. the correct option among the options that are already given in the question is the last or the fourth option. this business report created by steve will actually influence the investors about investing their money in steve's business. this business report will have all the details about the business, the amount of investment required and the amount of expected profit.

answer: (-6,3)

step-by-step explanation:

proportions are fractions that equal to each other. so if two fractions are the same, they are proportional.

let's check the answers to see if they are proportional.

question a is not proportional because you can't turn 1.5/3 to 3/9. if you try to multiply 1.5/3 by 2 or 3, you wont get 3/9. it's impossible to make the fractions the same.

question b is not proportional because you can't turn 22/33 to 4/6. 33 can't go into 6.

question c is proportional because when you multiply 2 and 3 by 71, you would get 142/213, and those fractions equal to each other

question d is proportional because when you divide 14 and 7 by 2, you would end up with 7/3.5, and those fractions equal to each other.

150

step-by-step explanation:

(sorry i'm not typing it again just read the other two explanation sections i just typed it'll be the same.)