Abox contains 20 marbles, 12 red and 8 blue. what is the probability for picking a blue marble and after replacing it picking a red marble

Step-by-step explanation:

Probability of an event can be formed from the fraction where the numerator is  the number of desired outcomes and the denominator is the number of total outcomes.  In this case, there are 20 marbles, so 20 total outcomes.  The desired outcome is first picking a blue, replacing it, and then picking a red.  Since you are replacing the marble, these events are independent, which means that they don't rely on previous events and the probability of picking a red or blue is the same each time:

When we combine independent events, we multiply the probabilities:

Analysis of graph :-

We have given one graph which is plot between distance and time. where time is in minutes and distance is in seconds.

According to the graph

For the first 5 minute ( O to A) , The distance is continously increasing 2m / per minute . For the 5 minute that is from 5 minute to 13 minute ( A to B) both marellize and her dog wally moving with the constant speed .For next 3 minutes that is from 10 minutes to 13 minutes ( B to C) , The distance is continously decreasing with time .For next 3 minutes that is from 13 to 16 minutes ( C to D) , Again they moved with constant speed .For next 6 minute that is from 16 to 21 minutes ( D to E) . Again, There distance is increasing with time .Again For next 4 minutes that is 21 to 25 minutes , they are moving with constant velocity .Let's Begin :-

1) Between O and A

The marellize and wally when moving between O to A , The distance is constantly increasing with time. The graph is Straight line

2) Between A and B

The marellize and wally when moving between A to B, The distance remains the same with time that is they moving with constant speed. The graph is constant or steady

3) Between B to C

The marellize and wally when moving between B to C, The distance is constantly decreasing with time .The graph is straight line but it follows decreasing function .

4) For covering the First 6 km ,

According to the graph,

For covering first 6 km, They took 3 minutes.

5) No, Marellize and wally walk does not from where they have started.

According to the graph

It is end at 5 m instead of 0m .