At a certain school, 25% of the students wear a watch and 30% wear a braclet. 60% of the students wear neither a watch nor a braclet. (a) One of the students is chosen at random. What is the probability that this student is wearing a watch or a braclet

Complete question :

At a certain school, 25% of the students wear a watch and 30% wear a braclet. 60% of the students wear neither a watch nor a braclet. (a) One of the students is chosen at random. What is the probability that this student is wearing a watch or a braclet (b) What is the probability that this student is wearing both a watch and a bracelet?

0.40 ; 0.15

Step-by-step explanation:

Given :

w = watch

b = bracelet

P(w) = 0.25

P(b) = 0.3

P(w' U b') = 0.60

Probability that student is wearing a watch or a bracelet :

P(w U b) = 1 - P(w' U b')

P(w U b) = 1 - 0.60

P(w U b) = 0.4

Probability that student is wearing a watch and a bracelet :

P(w n b) = p(w) + p(b) - p(w U b)

P(w n b) = 0.25 + 0.3 - 0.4

P(w n b) = 0.55 - 0.4

P(w n b) = 0.15

the terms of a geometric sequence can be found by beginning with the first term and multiplying by the common ratio repeatedly. a recursive formula for a geometric sequence with common ratio r is given by an=ran−1 a n = r a n − 1 for n≥2 n ≥ 2 .

step-by-step explanation:

no

explanation:

you can be freinds, and people but not follow people.