What is the mean between the numbers 3,19,21,6.8,9.3,21.7,2.9

About 11.96

Step-by-step explanation:

The mean of a data set is basically the average.

To find the average, add up all of the data values and then divide by the amount of numbers there are.

First, add the numbers.

3 + 19 + 21 + 6.8 + 9.3 + 21.7 + 2.9 = 83.7

There are 7 numbers in this data set so divide 83.7 by 7

83.7/7 = 11.95714285714286

Round this number to the nearest hundreth, to get 11.96

So, the mean of this data set is 11.96

I hope this helps!

the answer is 0.071

good luck! : d

the value of v.w= -12.

step-by-step explanation:

we are given three vector r,v and w as:

r = < 5, -5, -2> ; v = < 2, -8, -8> ; w = < -2, 6, -5>

we know that r,v and w could also be represented as:

r=5i-5j-2k

v=2i-8j-8k

and w= -2i+6j-5k

where i,j and k are the unit vectors of x,y and z-axis respectively.

also we know that it has the following property:

i.i=1 ; j.j=1; k.k=1

and i.=j.i=i.k=k.i=j.k=k.j=0

i.e. when we multiply two vectors or we find it's dot product we need to only multiply the components of x coordinates with each other; y with each other and z with each other.

hence, v.w= (2i-8j- -2i+6j-5k)

                  = 2×(-2)+(-8)×(6)+(-8)×(-5)

                  = -4-48+40

                  = -12

hence, v.w= -12