Tecart
three drivers competed in the same fifteen drag races. the mean and standard
deviation for the race times of each of the drivers are given.
driver a had a mean race time of 4.01 seconds and a standard deviation of 0.05
seconds
driver b had a mean race time of 3.96 seconds and a standard deviation of 0.12
seconds
driver c had a mean race time of 3.99 seconds and a standard deviation of 0.19
seconds.
a.
which driver had the fastest typical race time?
b.
which driver's race times were the most variable?
c.
which driver do you predict will win the next drag race? support your
prediction using the inean and standard deviation.

3

step-by-step explanation:

divide 13.5 by 9 to get the scale factor. it equals 1.5

2 * 1.5 = 3

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -

3000000000000000000000

if y=4x then you will substitute 4x in for y in the second equation.

8x + 4x = 18 combine like terms

12x = 18 divide by 12 on both sides

x = 18/12 or 3/2

now replace x in the first equation with 3/2 to get

y = 4 3/2

y = 6

the answer is a

(3/2,6)

hope that .

brainliest is always apprectiated