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2 years ago

HELP me I need to pass this test

Mathematics

2 answers:

Misha Larkins [42]2 years ago

6 0

Answer:

The last answer is correct

Step-by-step explanation:

zheka24 [161]2 years ago

6 0

Answer: its the last one

Step-by-step explanation:

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Use tables to find the indicated values

Romashka [77]

A is 12
B is 32
C is 7
D is 2

5 0

2 years ago

A random sample of 300 Americans planning long summer vacations in 2009 revealed an average planned expenditure of $1,076. The e

Rufina [12.5K]

Answer:

$(1024.69,\ 1127.31)$

Step-by-step explanation:

We know that the sample size was:

$n = 300$

The average was:

${\displaystyle {\overline {x}}}=1,076$

The standard deviation was:

$\s = 345$

The confidence level is

$1-\alpha = 0.99$

$\alpha=1-0.99\\\alpha=0.01$

The confidence interval for the mean is:

${\displaystyle{\overline {x}}} \± Z_{\frac{\alpha}{2}}*\frac{s}{\sqrt{n}}$

Looking at the normal table we have to

$Z_{\frac{\alpha}{2}}=Z_{\frac{0.01}{2}}=Z_{0.005}=2.576$

Therefore the confidence interval for the mean is:

$1,076\± 2.576*\frac{345}{\sqrt{300}}$

$1,076\± 51.31$

$(1024.69,\ 1127.31)$

This means that <em>the mean planned spending of all Americans who take long summer vacations in 2009 is between $ 1024.69 and $ 1127.31</em>

3 0

3 years ago

A rectangle has dimensions of 63 cm long and 66 cm wide , what is the area of the rectangle?

quester [9]

63x2=126
66x2=132
126+132=258

Area is 258cm

7 0

3 years ago

Read 2 more answers

Please someone help

anygoal [31]

Answer:

Nerys pays 3.1/3.84,5=84,5£per year

Eleri pays 3.84,5=253,5£per year

253,5-84,5=169£ more pay Eleri

5 0

3 years ago

You travel 275.5 miles in 8.5 hours whats the speed

hichkok12 [17]

We just need to change every value to the units in the question

We have to find meters per second. In 8.5 hours, there are (8.5*60*60 = 30,600) seconds.

1 mile = 1600 meters

275.5 * 1600 = 440800.

440800/30600 = 14.40522876 meters per second

7 0

3 years ago