karlaperez6852
10.11.2019 •
Mathematics
44.
how much do you study? a survey among freshmen at a certain university revealed that the number of hours spent studying the week before final exams was normally distributed with mean 25 and standard deviation 7.
a.
what proportion of students studied more than 40 hours?
b.
what is the probability that a randomly selected student spent between 15 and 30 hours studying?
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Ответ:
6(x + 9) = 3. x = -7
Step-by-step explanation:
if you distribute first it gives you 6x + 45 = 3 then you subtract 45 from each side which gets you 6x=-42 then divide by 6 to get x = -7.