e . e . u o applecreditunionr... e NewTalJ Semings M Gmall VouTube 9 Maps & Translate l ASKYOURTEACHER || PRACTICEANOTHER l | MY NOTES 3. [-l1 Points] SCALCB 8.5.010. (a) A type of lightbulb is labeled as having an average lifetime of 1000 hours. It's reasonable to model the probability of failure of these bulbs by an exponential density function with mean [1 : 1000. (i) Use this model to find the probability that a bulb falls within the rst 500 hours. (Round your answer to three decimal places.) E (ii) Use this model to find the probability that a bulb burns for more than 600 hours. (Round your answer to three decimal places.) E (b) What is the median lifetime of these lightbulbs? (Round your answer to one decimal place.) E hr Need Help? _7 SCALCB 8.5.017. MY NOTES l | ASK YOUR TEACHER l | PRACTICE ANOTHER 4. [-11 Points] The speeds of vehicles on a highway with speed limit 90 km/h are normally distributed with mean 101 km/h and standard deviation 10 km/h. (Round your answers to two decimal places.) (a) What is the probability that a randomly chosen vehicle is traveling at a legal speed? (b) If police are instructed to ticket motorisE driving 110 km/h or more, what percentage of motorist are targeted? Need Help