The acceleration times in seconds) from 0 to 60 miles per hour for 26 randomly selected sedans
are shown in the table at the left. The sample is
from a normally distributed population,
Construct a 98% level of confidence interval for
the population standard deviation, round your
intervals to the nearest hundredths. (Adapted
from Consumer Reports) *
Acceleration times
(in seconds)
6.8 8.3 7.6 7.2 7.5 7.6 93
7.8 9.4 6.4 8.2 7.7 7.8 9.8
6.3 6.4 8.9 6.2 9.0 9.6 8.3
9.1 6.2 9.7 7.1 9.4

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its not b

step-by-step explanation:

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