I need help with this homework programs all of them

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Question

i need help with this homework programs all of them.

Problem 1
a)
Mean = 6.49 hours
Standard deviation = 1.05/sqrt(150) = 0.0857 hours
b)
Probability of coming up with a sample that they studies 6 hours or less = P ( z amp

(6 – 6.49)/0.0857 )
= P(…
Statistics and Probability