Abag contains 75 marbles that are red, blue, or green. the ratio of red to blue marbles is 15: 7, and the ratio of blue to green marbles is 7: 3. if 2 marbles are removed and replaced with 2 green marbles, what will be the new ratio of red to green marbles.

5:5 or 7:3

Step-by-step explanation:

If there are 15 red marbles, there'll be 7 blue marbles.

If there are 7 blue marbles, there'll be 3 green marbles.

If we get 2 blue marbles and put 2 green, than things will stay like this:

If there are 5 blue marbles, there'll be 5 green marbles.

If we get 2 green marbles and put 2 green, than things will stay like this:

If there are 7 blue marbles, there'll be 3 green marbles.

Hope it helped,

BioTeacher101

yes

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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