Question

chase has been tracking his weekly grocery bills. the mean amount he spends in a week is $80 with a standard deviation of $10. last week, he spent $95 on groceries. what is the z - score for chases grocery expenses from last week? use the following formula to calculate z - score: $z=\frac{x - mu}{sigma}$ where $x$ is the data point, $mu$ is the mean, and $sigma$ is the standard deviation. 1.5 0.5 - 1.5 1.0

Explanation:

Step1: Identify values

$x = 95$ (last - week's expense), $\mu=80$ (mean), $\sigma = 10$ (standard deviation)

Step2: Apply z - score formula

$z=\frac{x - \mu}{\sigma}=\frac{95 - 80}{10}$

Step3: Calculate the result

$\frac{95 - 80}{10}=\frac{15}{10}=1.5$

Answer:

1.5