In a math class, 70% of the students have visited the ocean and 55% have visited the mountains on vacation before. If 35% of the students have visited the ocean and the mountains on vacation before, what is the probability that a randomly selected student has visited the ocean or the mountains?

0.9 is the required probability.

Step-by-step explanation:

We are given the following in the question:

Percentage of student that have visited the ocean = 70%

Percentage of student that have visited the Mountains = 55%

Percentage of student that have visited the Oceans and Mountains = 35%

We have to find  the probability that a randomly selected student has visited the ocean or the mountains.

We have to evaluate:

Putting values, we get,

Thus, 0.9 is the probability that a randomly selected student has visited the ocean or the mountains.

nope.   happens to me as well.

-aparri

answer:

total cost for tiles and paints is $924.  

step-by-step explanation:

we have been given that a community hall is in the shape of a cuboid. the hall is 40m long 15m high and 3m wide.

the paint will be required for 4 walls and ceiling.

let us find area of walls and ceiling.

therefore, the area of walls and ceiling is 1410 square meters.

given: cost for 10 litre of paint is $10 and 10 litre paint covers 25 square meter. therefore,

therefore, the total painting cost is $564.

tiles will be required for floor. let us find the area of floor.

given: 1m squared floor tiles costs $3. so,

therefore, the total tiles cost is $360.

now let us find combined total cost of tiles and paint.

therefore, the combined total cost of tiles and paint is $924.