The mean of a set of data is 108.06 and its standard deviation is 115.45. Find the z score for a value of 489.67. Round to two decimal places as needed.

The z-score for the value 489.67 is 3.31.

Step-by-step explanation:

If X N (µ, σ²), then , is a standard normal variate with mean, E (Z) = 0 and Var (Z) = 1. That is, Z N (0, 1).  

The distribution of these z-variate is known as the standard normal distribution.

The information provided is:

μ = 108.06

σ = 115.45

Compute the z-score for the raw score X = 489.67 as follows:

Thus, the z-score for the value 489.67 is 3.31.

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