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yuradex [85]
3 years ago
14

Students of a large university spend an average of $5 a day on lunch. The standard deviation of the expenditure is $3. A simple

random sample of 36 students is taken. a) What is the expected value, standard deviation, and shape of the sampling distribution of the sample mean
Mathematics
1 answer:
Nikolay [14]3 years ago
5 0

Answer and Step-by-step explanation:

According to the situation the solution is shown below:-

The expected value is

\mu = 5

The standard deviation is

= $3

The sample distribution of the sample standard deviation is

\sigma_x = \frac{\sigma}{\sqrt{n} } \\\\ = \frac{3}{\sqrt{36} } \\\\ = \frac{3}{6}

After solving the above equation  we will get

= 0.5

Basically we applied the applied formula so that each part could be determined

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23 x 46 = blank × 23 <br>find the missing number help please ​
myrzilka [38]

Answer:

23x46=46x23

Step-by-step explanation:

4 0
2 years ago
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Of 10 test​ scores, eight are less than or equal to 82. What is the percentile rank of a test score of ​82?
sdas [7]

Answer:

80%

Step-by-step explanation:

Percentile rank = (number of scores lower or equal to 82 / total number of scores) * 100%

Percentile = (8 / 10) * 100%

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5 0
3 years ago
Frank and his mom are planting vegetables in their garden. Frank has finished planting 8 rows of carrots so far and is planting
Yuliya22 [10]

Answer:

It will take 3 hours. They will both have completed 11 rows.

Step-by-step explanation:

1 row of carrots per hour = frank

3 rows of tomatoes per hour = frank's mom

right now, this is how many they have completed

frank - 8 rows

mom - 2 rows

1st hour

f - 9

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8 0
2 years ago
How many factors of muliplication does 20 have
amid [387]

Here are some factors of 20!

1x20=20

2x10=20

4x5=20

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Therefore there are 4 factors of 20.

4 0
2 years ago
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A vacuum had been marked down by 20% and solf for $250. What was the original price of the vacuum?
igomit [66]

Answer:

The original price was $312.50

Step-by-step explanation:

If the vacuum was marked down by 20%, that means it was sold for 80% of the full price. It was sold for $250, so 80% of the original price is $250.

Let's set up an equation.

80/100 of x = 250

0.8 • x = 250

Divide both sides by 0.8.

x = 312.50

The original price was $312.50

Hope this helps!

7 0
2 years ago
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