3 years ago

Solve the equation 2z-5=11

Mathematics

2 answers:

worty [1.4K]3 years ago

5 0

I think the answer would be z=8

borishaifa [10]3 years ago

3 0

2z-5=11
+5 +5
2z = 16
÷2 ÷2
z = 8

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9.4 The heights of a random sample of 50 college stu- dents showed a mean of 174.5 centimeters and a stan- dard deviation of 6.9

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Answer: a) (176.76,172.24), b) 0.976.

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(a) Construct a 98% confidence interval for the mean height of all college students.

$x\pm z\times \dfrac{\sigma}{\sqrt{n}}\\\\=(174.5\pm 2.326\times \dfrac{6.9}{\sqrt{50}})\\\\=(174.5+2.26,174.5-2.26)\\\\=(176.76,172.24)$

(b) What can we assert with 98% confidence about the possible size of our error if we estimate the mean height of all college students to be 174.5 centime- ters?

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