I am struggling with standard deviation.

I am struggling with standard deviation. Please help me with this question and explain how you got the answer.
The following data were obtained from a survey of college students. The variable X represents the number of non-assigned books read during the past six months.
x
0
1
2
3
4
5
6
P (X=x)
0.55
0.15
0.10
0.10
0.04
0.03
0.03
Find P(X < 2).
 
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