Answer #6 & 7 6. In a certain elementary school, 52% of the students are girls. A sample of 75 students is drawn. a. Fin

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Answer #6 & 7
6. In a certain elementary school, 52% of the students
are girls. A sample of 75 students is drawn.
a. Find the mean μ. Write this proportion as a
decimal.
b. Find the standard deviation σ. Round to the nearest
thousandths (3 decimal places)
c. What is the probability that more than 65% of them
are girls? Round to the nearest thousandths (3 decimal
places)
d. Would it be unusual for more than 65% of them to be
girls? yes/no
e. Find the probability that the proportion of the
sampled students are girls is between 40% and 50% Round to the
nearest thousandths (3 decimal places)
7. YES OR NO
Is it normal? Is it reasonable to treat the following
sample as though it comes from an approximately normal
population?
2.5 4.1 1.4 1.9 0.5 0.6 6.5 2.1 9.6 1.7 4.1 4.3 0.5
Yes or
No
Is it normal? Is it reasonable to treat the following
sample as though it comes from an approximately normal population?
Explain.
8.7 11.1 11.5 6.2 9.3 1.4 14.5 7.4 5.1 9.1 4.2 9.8 7.7
13.1
Yes
or No