What was the number of blue marbles in the bag before any changes were made?

What was the number of blue marbles in the bag before any changes were made?

What was the number of blue marbles in the bag before any changes were made? The answer sheet says 16.

What is the probability that both are red?

In conclusion, the probability that both of the balls are red is 1/10.

What is the chance of picking a red or a green marble?

The probability that the marble is either red or green is 0.8.

What is the probability of drawing two red balls?

On your first pick, the probability is 11/16 that you choose a red ball. On the second pick, the probability is 10/15 that you choose a red ball. So 11/16*10/15 = 110/240 = 45.83\% chance of picking two red balls in a row.

What is probability of red marble?

Note that there are 16 total marbles. A is simply a set of sequential events. On the first, you have 10/16 chances to draw a red. Supposing this red is not replaced, the chance of drawing a second red will be 9/15; therefore, the probability of A is (10/16) * (9/15) = 0.375.

Are there different numbers of pencils in order?

Of course! Pencil makers manufacture No. 1, 2, 2.5, 3, and 4 pencils—and sometimes other intermediate numbers. The higher the number, the harder the core and lighter the markings. (No. 1 pencils produce darker markings, which are sometimes preferred by people working in publishing.)

When were pencils first made?

(No. 1 pencils produce darker markings, which are sometimes preferred by people working in publishing.) The current style of production is profiled after pencils developed in 1794 by Nicolas-Jacques Conté. Before Conté, pencil hardness varied from location to location and maker to maker.

What does 9H mean on a pencil?

Lowest on the scale is 9H, indicating a pencil with extremely hard lead that produces a light mark. On the opposite end of the scale, 9B represents a pencil with extremely soft lead that produces a dark mark. (“F” also indicates a pencil that sharpens to a fine point.)

What does h and B mean on a pencil?

“H” indicates hardness and “B” indicates blackness. Lowest on the scale is 9H, indicating a pencil with extremely hard lead that produces a light mark.