Suppose that the average score on the GMAT exam is 500 and that the standard deviation of all scores is 100 points. You would expect approximately 95% of all GMAT scores to be between400 and 600
300 and 700
200 and 800
350 and 650
250 and 750

300 and 700

Step-by-step explanation:

-We use the t-statistic and sample mean to generate the desired confidence interval.

-Given that the average score is 500 and standard deviation is, we calculate the confidence interval as:

Hence, the expected scores is approximately between 300 and 700

Area of the rectangle = ( x²+12x+27)unit²

Step-by-step explanation: Length = x+3  Breadth = x+9

∴ Area of Rectangle = L×B

(x+3)(x+9) = x²+9x+3x+27 = (x²+12x+27) unit²