If you are conducting a significance test for the difference between the means of two independent samples, whats your null hypothesis?

What is the value of 1/3× + 7x, when x =5

The weights of players in a basketball league are distributed normally. the distance (d) of each player's weight (w) from the mean of 86 kilograms was computed as follows: d = |w - 86| if d is greater than 7 for approximately 5% of the players, what is the approximate standard deviation of the players' weights? a. 1.75 kilograms b. 3.5 kilograms c. 4.3 kilograms d. 7 kilograms

Hi my sisters and brothers can tell me the answer because i don’t understand the question