Suppose that the number of customers entering a department store in a day is a random variable with mean of 21 customers/day. suppose that the amount of money spent by each one of these customers is a random variable is governed by the following probability: with probability 1/5 a customer spends $20, with probability 2/5 a customer spends $10, with probability 2/5 a customer spends $5. the amounts spent by different customers are statistically independent. also assume that the amount spent by each customer is independent of the number of customers to enter the store. calculate the average cumulative amount spent by all customers that visit the store in a day.

im not sure

step-by-step explanation:

x =±sqrt(1/3)

step-by-step explanation:

x+4/6x=1/x

multiply each side by 6x to get rid of the fractions

6x*(x+4/6x)=1/x*6x

distribute

6x^2 +4 = 6

subtract 4 from each side

6x^2 +4-4 = 6-4

6x^2 =2

divide by 6

6x^2/6 = 2/6

x^2 = 1/3

take the square root of each side

sqrt(x^2) = ±sqrt(1/3)

x =±sqrt(1/3)

i believe the answer is the polygon, heptagon.

part d

step-by-step explanation:

theresa talked her parents into getting sd cards for her phone and her brother’s phone. inserting an sd card into a phone gives it more storage. they both get 8-gigabyte sd cards. how many bits of storage come with each sd card? type your answer in both scientific and standard notation.