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morpeh [17]
3 years ago
6

Hannah's school hosted a book donation. There are 150150150 students at her school, and they donated a total of bbb books! Hanna

h donated 333 times as many as the average number of books each student donated. How many books did Hannah donate
Mathematics
2 answers:
vivado [14]3 years ago
8 0

Answer:

b/50

Step-by-step explanation:

Anna [14]3 years ago
5 0

Answer:

Hanna donated b/50 books

Step-by-step explanation:

In this problem, we have:

n = 150 number of students at Hanna's school

b = ? number of total books donated by the students

Also, Hannah has donated 3 times as many as the average number of books each student donated.

The average number of books each student donated can be written as:

\frac{b}{150}

And calling

h = number of books donated by Hannah

This means that

h=3(\frac{b}{150})

Simplifying, this can be rewritten as

h=\frac{b}{50}

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A square piece of paper is folded in half vertically. If the resulting figure has a perimeter of 12 cm what was the area of the
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3 years ago
The shear strength of each of ten test spot welds is determined, yielding the following data (psi). 409 378 358 362 389 404 415
dybincka [34]

Answer:

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b. At 95%, X = 1.645σ + μ

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Step-by-step explanation:

Mean = (409 + 378 + 358 + 362 + 389 + 404 + 415 + 375 + 367 + 396)/10

Mean = 3853/10

Mean = 385.3

Therefore, Average shear strength = 385.3

Variance = (409 - 385.3)² + (378  - 385.3)²+ (358  - 385.3)² + (362  - 385.3)²+ (389  - 385.3)²+ (404  - 385.3)²+ (415  - 385.3)²+ (375  - 385.3)²+ (367  - 385.3)²+ (396 - 385.3)²/10

Variance = 3704.1/10 = 370.41

Standard deviation = √370.41 = 19.25

Therefore, standard deviation of shear strength is ±19.25

b. Using normal distribution table at 95%, z = 1.645

z= (X - μ)/σ  

Therefore X = 1.645σ + μ

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z= (X - μ)/σ

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3 years ago
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