Bonjour, j’ai un dm à rendre pour demain et j’aimerai vraiment avoir de l’aide, je n’y arrive pas et je serai éternellement reconnaissant à la personne qui pour faire mon exercice ou même m’aider, merci beaucoup.

An insurance company wants to know if the average speed at which men drive cars is higher than that of women drivers. the company took a random sample of 27 cars driven by men on a highway and found the mean speed to be 72 miles per hour with a standard deviation of 2.2 miles per hour. another sample of 18 cars driven by women on the same highway gave a mean speed of 68 miles per hour with a standard deviation of 2.5 miles per hour. assume that the speeds at which all men and all women drive cars on this highway are both approximately normally distributed with unknown and unequal population standard deviations.

Arock collection comes from which part of earth?

If a tank filled with water contains a block and the height of the water above point a within the block is 0.8 meter, what is the pressure at point a?