Mathematics, 12.03.2020 15:48 Chen19241

A middle school principal has 80 keys on her key chain to distribute to staff on the first day of school. Of
these 80 keys, 60 open classroom doors, 40 open the door to the teachers' lounge, and 30 open classroom
doors and the teachers' lounge. Using this information, answer each of the following questions.
Let C be the event that a randomly selected key opens a classroom and T be the event that a randomly
selected key opens the teachers' lounge.
What is P(C), the probability that a key opens a classroom?
What is P(T), the probability that a key opens the teachers' lounge?
What is PC and T), the probability that a key opens a classroom and the teachers' lounge?
What is P(C or T), the probability that a key opens a classroom or the teachers' lounge?

Answers: 1

Show answers

Another question on Mathematics

Mathematics, 21.06.2019 20:50

The first side of a triangle measures 5 in less than the second side, the third side is 3 in more than the first side, and the perimeter is 17 in. how long is the third side? if s represents the length of the second side, which of the following represents the length of the third side? s-5 ws-2 s+ 3 next question ask for turn it in

Answers: 1

Answer

Mathematics, 22.06.2019 00:00

Aspacecraft can attain a stable orbit 300 kilometers above earth if it reaches a velocity of 7.7 kilometers per second. the formula for a rocket's maximum velocity v in kilometers per second is vequalsminus0.0098tplusc ln upper r, where t is the firing time in seconds, c is the velocity of the exhaust in kilometers per second, and r is the ratio of the mass of the rocket filled with fuel to the mass of the rocket without fuel. find the velocity of a spacecraft whose booster rocket has a mass ratio of 20, an exhaust velocity of 2.1 km/s, and a firing time of 15 s. can the spacecraft achieve a stable orbit 300 km above earth?

Answers: 3

Answer

Mathematics, 22.06.2019 00:30

If m_b=mzd= 43, find mzc so that quadrilateral abcd is a parallelogram o 86 137 o 129 43 description

Answers: 1

Answer

Mathematics, 22.06.2019 01:30

Pls what is the decimal equivalent of 5 over 9? select one: a. 0 point 5 bar over top of 5 b. 0 point 6 bar over top of 6 c. 0 point 8 bar over top of 8 d. 0 point 9 bar over top of 9

Answers: 1

Answer

You know the right answer?

A middle school principal has 80 keys on her key chain to distribute to staff on the first day of sc...

Questions