Need help on this asap

mean height = 30.5

Step-by-step explanation:

To find an estimate for the mean height, we need to use a pondered weight of the height of the plants.

The midpoints of each interval of height are:

0 to 10 -> 5

10 to 20 -> 15

20 to 30 -> 25

30 to 40 -> 35

40 to 50 -> 45

50 to 60 -> 55

Using the frequencies as the weights, we have:

mean height = (1*5 + 4*15 + 7*25 + 2*35 + 3*45 + 3*55) / (1+4+7+2+3+3)

mean height = 30.5

step-by-step explanation:

descending order means to order the polynomials from the term with the largest exponent to the term with the smallest exponent.  

therefore, the correct answer is d.