According to the z-scores, would the life spans of any of these tires be conside

Question

According to the z-scores, would the life spans of any of these tires be considered unusual?

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Also need PART B, finding the percentile that corresponds to each lifespan.

Do Homework Rachael Hamilton Google Chrome dent/PlayerHomework.aspx?home onald hed false&cld-4321869;&centenwin; yes Secure https:// STA220 Homework: Section 2.5 Score: 0.57 of 1 pt 20 of 23 (23 complete) 2.5.48 The life spans of a species of fruit fly have a bell-shaped distribution, with a mean of30 days and a standard deviation of 5 days. a a) The life spans of three randomly selected fru It flies are 35 days, 28 days, and 42 days. Find the Z-Sc ore that corresponds to each lie span. Determine ethel any of these life spans are unusual (b) The life spans of three randomly selected fruit flies are 40 days, 45 days, and 25 days. Using the Empirical Rule, find the percentile that corresponds to each life span. a) The 2-score corresponding a life span of 35 days is pe an integer or a decimal rounded to two decimal places as needed.) Enter your answer in the answer box and then click Check Answer Clear All remaining Ask me anything Rachael Hamilton 3WTI17 1:22 AM Save HW Score: 90.79%, 20.88 of 23 pts 23 AM 3//2017

Explanation / Answer

Here mean=30 and sd=5

a. A z score are as below

For x=35, z=x-mean/sd=1

For x=28, z=28-30/5=-0.4

For x=42, z=42-30/5=2.4

b. x=40, z=40-30/5=2 so 98th percentile

x=45, z=3 so 100th percentile

x=25, z=-1, so 16th percentile

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