A bag contains 3 red marbles, 4 blue marbles and 5 yellow marbles. In this experiment you reach in the bag, select a marble, record it and replace it. You then select a second marble. What is the probability that you draw 2 blue marbles?

1/9

Step-by-step explanation:

the probability of one blue marble is 1/3 so to find the probability of 2 marbles you multiply it by itself.

the answer is d

step-by-step explanation:

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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step-by-step explanation: