Marnie conducted an experiment using a bag of 12 marbles containing an equal number of blue, red, and green marbles. she randomly chose one marble, noted the color, and returned the marble to the bag. marnie did this for a total of 20 trials. the table below shows the results.

event
count
blue
7
red
8
green
5

what was the experimental probability of choosing a blue marble from a bag?

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500

Write the expression as a single natural logarithm. 2 in a - 4 in y

Barney & noblet customers can choose to purchase a membership for $25 per year members receive 10% off all store purchases 1. how much would a member pay per year if he bought $50 worth of items each year? 2. write a slope-intercept equation that expresses how much a member pays per year using x to represent his purchases per year 3. how much would a member have to spend per year to pay off his membership fee?