For a certain type of computers, the length of time between charges of the battery is normally distributed with a mean of 50 hours and standard deviation of 15 hours.
a) What is the probability that a computer fully charged will only last for 40 hours?
b) What is the probability that a computer fully charged will last for 70 hours?
c) What percentage of computers that will last between 40 hours and 50 hours when fully
charged?

Which of the following would represent the sum of 3 consecutive integers if x is the first integer?

Can't gugys answer the ratio question. this is urgent the plans of a building is drawn toward scale of 1: 1000. kfc the foyer on the plans measures 62mm by 54mm, how large is the foyer in real life?

Marco is studying a type of mold that grows at a fast rate. he created the function f(x) = 345(1.30)x to model the number of mold spores per week. what does the 1.30 represent? how many mold spores are there after 4 weeks? round your answer to the nearest whole number. 1.30 represents the number of mold spores marco had at the beginning of the study; 985 mold spores 1.30 represents the number of mold spores grown in a given week; 448 mold spores 1.30 represents the 30% rate of weekly growth; 345 mold spores 1.30 represents the 30% rate of weekly growth; 985 mold spores