1. Xtreme Motorsports tacks sales made throughout the day. Let X be the number of motorcycles sold during the first hour of business on a randomly selected day. The probability distribution of X is as follows. 0 1 2 3 4 Motorcycles sold X: Probability P(X): 0.35 0.3 b 0.05 0.05 a) Find the value of b (1 pt) b) Find the mean of the distribution and interpret in context (3 pts) c) Find the standard deviation of the distribution and interpret in context (3 pts) d) What is the probability that Xtreme Motorsports sells more than 1 motorcycle in the first hour of business? (2 pts) ​

Which of the following is a disadvantage of using solar energy? a. it requires good sun exposure. b. it is abundantly available. c. it is a renewable resource. d. it reduces greenhouse gas emissions.

1) earth's crust is made up of relatively rigid plates that ride atop earth's hot, semiliquid mantle. (2) the plates are called tectonic because they're in constant motion. (3) they can move because earth's mantle is a very hot and semiliquid fluid called magma. (4) volcanoes are a result of magma rising up or erupting through a plate, particularly where plate boundaries are moving against each other. (5) also, when plates slide against each other, causing friction along adjacent plate boundaries, earthquakes frequently occur. (6) therefore, we often find volcanoes and earthquakes along plate boundaries. (7) plates may also collide. (8) when that happens, mountain ranges are formed. (9) for example, the collision of the plate carrying the indian subcontinent created the himalayan mountains when it collided with the asian plate. 2. which sentence in this passage introduces a new topic that might begin a new paragraph? a. sentence 5 b. sentence 4 c. sentence 7 d. sentence 6

B. speculate about one positive way and one negative way that this boundary has affected the geographical units it separates over time.