Please help with this

= n² + 4n ; n = 11

Step-by-step explanation:

= [2 + (n - 1)d]

~~~~~~~~~

= 5

d = 7 - 5 = 2

= [ 2(5) + 2(n - 1)] = ( 8 + 2n ) = 4n + n²

= n² + 4n

n² + 4n = 165

n² + 4n - 165 = 0

(n + 15)(n - 11) = 0 ( n ≥ 0 ) ⇒ n = 11

solution:

as, mean is defined as sum of all the observations divided by total number of observations.

and , median is mid value of the data whether arranged in ascending order or descending order.

consider, roadsters:

2,3,4,5,6,7,8,9

mean =

also, median= , because number of observations is even, so median is mean of two mid values.

now, coming to bandits

2,3,4,5,6

mean =  

median = 4, as number of observations is odd.

so, roadsters has greater median as well mean than bandits.

→option a is true about the repairs performed on 2 types of cars:

bandits have lower median and mean than roadsters.

i can you with this question sweetie!

step-by-step explanation: