Texting:Five teenagers are selected at random. LetX

be the number of them who have sent text messages on their cell phones within the past30

days. According to a recent study, the probability distribution ofX

is as follows:

x

0

1

2

3

4

5

P

x

0.014

0.098

0.258

0.343

0.227

0.060

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Part 1 of 6

(a) FindP

4

.

=

P

4

0.227

.

Part:1 / 6

1 of 6 Parts Complete

Part 2 of 6

(b) FindP

More than3

.

P

More than=

3

0.287

.

Part:2 / 6

2 of 6 Parts Complete

Part 3 of 6

(c) Find the probability that four or more of the teenagers sent text messages.

The probability that four or more of the teenagers sent text messages is

.