The manager of a grocery store has taken a random sample of 100 customers. the average length of time it took these 100 customers to check out was 3 minutes. it is known that the standard deviation of the population of checkout times is 1 minute. the standard error of the mean equals?

The standard error of the mean equals 0.1            

Step-by-step explanation:

We are given the following in the question:

Sample mean, = 3 minutes

Sample size, n = 100

Population standard deviation, σ = 1 minute

Formula:

Thus, standard error of the mean equals 0.1

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225

total amount to be paid = $19.5

step-by-step explanation:

given ,

original price = $25.99

discount = 25%

discount amount = 25% of original price

discount amount = 25/100   * 25.99

discount amount = $6.49

hence , the total amount to be paid = original price - discount amount

                                                            = $25.99 - $6.49

                                                            =$19.5

total amount to be paid = $19.5