Question

1. Serena is in a math class of 20 students. Each day for a week (Monday to Friday), a student in Serena’s class is

Answer 1

Answer:

a) 0.05

b) 0.0526

c) 0.0625

Step-by-step explanation:

Data provided in the question:

Total number of students in a class = 20

a) since it is Monday, no student will be selected already.

Therefore,

There are 20 students from which one can be selected

Thus,

P(Serena is selected on Monday) = 1 ÷ [Number of students available]

= 1 ÷ 20

= 0.05

b) On Tuesday, one student has already been selected on Monday

Therefore,

There are (20 - 1) = 19 students from which one can be selected

Thus,

P(Serena is selected on Tuesday) = 1 ÷ [Number of students available]

= 1 ÷ 19

= 0.0526

c) On Friday , 4 student has already been selected on Monday

Therefore,

There are (20 - 4) = 16 students from which one can be selected

Thus,

P(Serena is selected on Tuesday) = 1 ÷ [Number of students available]

= 1 ÷ 16

= 0.0625