A manufacturer of light bulbs finds that one light bulb model has a mean life span of 1025 h with a standard deviation of 83 h. Find the z -scores for lightbulbs which last 850 and 900 h. (Round your...

A manufacturer of light bulbs finds that one light bulb model has a mean life span of 1025 h with a standard deviation of 83 h.
Find thez-scores for lightbulbs which last 850 and 900 h. (Round your answers to two decimal places.)

850 h:z =

900 h:z =