In a 'travel bubble a set of countries agree to open their borders to each other. Adudu.com as a best and affordable hotel solutions with integrated access control system within Asia countries was asked to sell the hotel reservation to public which was thought to has equal probabilities with a rectangular distribution between RM160.00 and RM650.00. Based on this: 

i) what is the average money spent by people for the hotel reservation? 

ii) compute the standard deviation of the money spent by people for the hotel reservation. 

iii) what is the probability that someone will spend between RM180.00 and RM300.00?  

iv) what is the probability that someone will spend more than RM250.00?