3 years ago

20 POINT QUESTION

Mathematics

1 answer:

Likurg_2 [28]3 years ago

7 0

See the attached picture

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A manufacturer of cell phone screens has found that 5 percent of all screens produced have defects. Let pd represent the populat

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Step-by-step explanation:

B,.C and D are wrong because

B states all. The hypothesis stated above does not mention all samples

C. Mentions a mean. Per the hypothesis, the percentage of defective screens was an actual number and not a mean.

D. The question is not referring to a standard deviation

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If you mean out of £48,

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A swimming pool is open for 7 1/2 hours during a day. The pool keeps one lifeguard on duty at a time, and each lifeguard's shift

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4 years ago

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Kristin spent $131 on shirts. Fancy shirts cost $28 and plain shirts cost $15. She bought seven total shirts. How many fancy and

kykrilka [37]

Kristin bought 2 fancy shirts and 5 plain shirts.

Step-by-step explanation:

Amount spent on shirts = $131

Cost of one fancy shirt = $28

Cost of one plain shirt = $15

Shirts bought = 7

Let,

x be the number of fancy shirts bought

y be the number of plain shirts bought

According to given statement;

x+y=7 Eqn 1

28x+15y=131 Eqn 2

From Eqn 1

$x=7-y$

Putting this value of x in Eqn 2

$28(7-y)+15y=131\\196-28y+15y=131\\-13y=131-196\\-13y=-65$

Dividing both sides by -13

$\frac{-13y}{-13}=\frac{-65}{-13}\\y=5$

Putting y=5 in Eqn 1

$x+5=7\\x=7-5\\x=2$

Kristin bought 2 fancy shirts and 5 plain shirts.

Keywords: linear equation, substitution method

Learn more about linear equations at:

#LearnwithBrainly

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