This is really confusing. for .

use descartes’s rule of signs to describe the real zeroes of the function f(x) = 2x^5 - x^4 -2x^3 + 4x^2 + x - 2.

a. the function has two or zero positive real zeroes and either three or one negative real zeroes.
b. the function has two or zero negative real zeroes and either three or one positive real zeroes.
c. the function has one positive real zeroes and either four or two negative real zeroes.
d. the function has one negative real zeroes and either four or two positive real zeroes.

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.