X P(x) 0 0.25
1 0.3
2 0.25
3 0.2

Required:
Find the standard deviation of this probability distribution.

Need on this one asap im almost done with this subject

Is this a polynomial function? i need to know asap

The boiling point of water at an elevation of 0 feet is 212 degrees fahrenheit (°f). for every 1,000 feet of increase in elevation, the boiling point of water decreases by about 2°f. which of the following represents this relationship if b is the boiling point of water at an elevation of e thousand feet? a) e = 2b - 212 b) b = 2e - 212 c) e = -2b + 212 d) b = -2e + 212