Question

In a large bag of marbles, 25% of them are red. A child chooses 4 marbles from this bag. If the child chooses the marbles at random, what is the chance that the child gets exactly three red marbles?
A) 0.047
B) 0.141
C) 0.211
D) 0.063

A pet supplier has a stock of parakeets of which 10% are blue parakeets. A pet store orders 3 parakeets from this supplier. If the supplier selects the parakeets at random, what is the chance that the pet store gets exactly one blue parakeet?
A) 0.081
B) 0.243
C) 0.027
D) 0.003
In a large bag of marbles, 25% of them are red. A child chooses 4 marbles

Answer 1

\( \large Since~you~seem~new~here:\\\bf\Huge{~~\color{red}{\boxed{W}}\color{#FF9200}{\boxed{E}}\color{#FFDB00}{\boxed{L}}\color{#B6ff00}{\boxed{C}}\color{#00ff49}{\boxed{O}}\color{#00DBff}{\boxed{M}}\color{#B600ff}{\boxed{E}}\\~~~~~~~~~~~~~~~~~~\boxed{T}\boxed{O}\\~~~~~~~~~~~\color{#0092ff}{\boxed{O}}\color{#0092ff}{\boxed{P}}\color{#0092ff}{\boxed{E}}\color{#0092ff}{\boxed{N}}\color{#7cc517}{\boxed{S}}\color{#7cc517}{\boxed{T}}\color{#7cc517}{\boxed{U}}\color{#7cc517}{\boxed{D}}\color{#7cc517}{\boxed{Y}}\color{#7cc517}{\boxed{!}}}
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\\ \it \large Now~let's~try~to~find~an~answer~to~your~problem~together.\)

Answer 2

at the first question, you want 3 red marbles, each of them with a 25% chance (since it an infinitely large bag apparently, the chance will not decrease/increase by drawing from it). and we also want one that is not red, which has a 100-25% chance. Multiply those 4 percentages and what do you get?