Drake spent $540 on books. Math books cost $60 and science books cost $80. If he bought a total of 8 books, how many of each kin
2 answers:
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Answer:
109.33
Step-by-step explanation:
given that the population has a distribution with a mean of 110 and a standard deviation of 8
Sample size n = 40
Std error of sample mean = std dev/square root of sample size
=
From std normal distribution table we find that 30th percentile for Z is
-0.5244
Corresponding x score =
30th percentile = 109.33663
=109.33
ANSWER: ? = -21
P/s: ? = x < let ? is x >
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