A23 - In class sample size problem: A company has set a goal of developing a battery that lasts five hours (300min) in continuous use. In a first test, eight of these batteries measured the following lifespans (in min.): 321, 295, 332, 351, 281, 336, 311, 253. How many batteries must we test to be 99% sure of estimating the mean lifespan to within 15 minutes

i dont know and i dont care for math bc it is a stupied subject

step-by-step explanation:

step-by-step explanation:

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ranks (& how to earn them):

-beginner (needs at least 0 points & 0 brainliest answers)

- hand (needs at least 100 points & 0 brainliest answers)

-ambitious   (needs at least 250 points & 0 brainliest answers)

-virtuoso (needs at least 500 points & 5 brainliest answers)

-expert   (needs at least 1,000 points & 10 brainliest answers)

-ace (needs at least 3,000 points & 15 brainliest answers)

-genius   (needs at least 15,000 points & 50 brainliest answers)

how to award brainliest:

you must wait until 2 people answer to award brainliest. i'm pretty sure that it should be next to the "" and "comments" buttons.