-Stats- A farmer claims that the average size of farms in Indiana County, Pennsylvania is the same as the average size of Greene County, Pennsylvania. In a sample of 8 farms, the average size of a farm in Indiana County, Pennsylvania, is 191 acres with a standard deviation of 18 acres. In a separate sample of 10 farms, the average size of farm in Greene County, Pennsylvania, is 199 acres. with standard deviations 12 acres. At the 1% significance level, can you reject the claim that the average size of the farms in the two counties is the same? Assume the populations are normally distributed and that the population variances are not equal

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.

a is the right answer

u = -(6/7)w

step-by-step explanation:

place all values with 'u' on one side of the equation.

4u + 8w = - 3u + 2w

4u + 3u = 2w - 8w

further simplify the equation by solving the addition and subtraction.

7u = - 6w

make 'u' the independent variable by placing its co-efficient on the right-hand side.

u = - (6/7)w

the correct answers i think are b. and d.

give me brainliest if it is correct!