1. Following is the probability distribution of a random variable that represents the number of extracurricular activities a college freshman participates in.

x	0	1	2	3	4
Px	0.05	0.13	0.45	0.21	0.16

The probability that a student participates in less than three activities is

2. Put some air in your tires: Let X represent the number of tires with low air pressure on a randomly chosen car. The probability distribution of X is as follows.

x	0	1	2	3	4
Px	0.1	0.3	0.2	0.2	0.2

Find P (Greater than or equal to 2)

3. School days: The following table presents the numbers of students enrolled in grades 1 through 8 in public schools in a certain country.

Grade	Frequency (in 1000s)
1	3755
2	3634
3	3623
4	3589
5	3603
6	3663
7	3713
8	3762
Total	29,342

The probability that the student is in sixth grade is. (Round the answer to three decimal places.)