abell23000
19.12.2019 •
Mathematics
The life in hours of a battery is known to be approximately normally distributed, with standard deviation hours. a random sample of 10 batteries has a mean life of x overbar equals 40.5 hours. (a) is there evidence to support the claim that battery life exceeds 40 hours
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Ответ:
Step-by-step explanation:
-9/14+ 2/7
-9+4/14
5/14
hope it helps you