The National Oceanographic and Atmospheric Association (NOAA) has provided data for global temperature changes from the 20th century average temperature of 13.9ᵒC. The temperature changes are given with the number of years in two separate frequency tables below. Table I Table 2

50 Years from 1901 – 1950 49 Years from 1968-2017

(No Data from 2005)

ᵒC change

Frequency

(# years)

ᵒC change

Frequency

(# years)

-0.4

6

-0.1

3

-0.3

9

0.0

4

-0.2

12

0.1

3

-0.1

12

0.2

6

0.0

5

0.3

8

0.1

1

0.4

8

0.2

4

0.5

3

0.3

1

0.6

8

0.4

0

0.7

3

0.5

0

0.8

1

0.6

0

0.9

2

1. Find a weighted mean for the ᵒC change from the data in the first table, 1901 through 1950, by multiplying the ᵒC change amount by the frequency, then totaling the results for Table 1 and dividing by the total number of years, 50, for the first table. You now have a weighted mean change for Table 1.

the answer is 844

step-by-step explanation:

it is 844 because if you add 836.50 + 7.5 you will get 844

b.my answer is b.

brainliest

when rotating a figure 180 degrees, imagine that you are able to take the figure and turn it clockwise or counterclockwise around a center point. to rotate a figure 180 degrees, you will need to apply the rule (x, y) → (-x, -y). start by using a coordinate grid with coordinates for each vertex of the figure. the center point of the coordinate grid is located at (0, 0), which is what you will rotate the figure around. write down the original coordinates of the shape you are going to rotate. then, apply the rule. for example, coordinate (1, 2) becomes (-1, -2). another example would be, coordinate (-4, -2) becoming (4, 2). after you change each original coordinate to the rotated coordinate, you will draw your new figure.

step-by-step explanation: