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3 years ago

ILL MARK BRAINIEST IF YOU CAN DO THESE 2 QUESTIONS RIGHT!!!

Mathematics

2 answers:

spayn [35]3 years ago

5 0

Answer:

Step-by-step explanation:

dont know the 2nd :(

Stella [2.4K]3 years ago

3 0

Answer:

1) p = 0.75n

2) 17 children

Step-by-step explanation:

1.50 ÷ 2 = 0.75 which is the price per mango

177.50 = 50 + 7.5n

127.5 = 7.5n

n = 17

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3 years ago

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Please help ASAP! All questions.

natka813 [3]

Answer:

I think i don't really know its been awhile for me.

Step-by-step explanation:

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3 years ago

A major department store chain is interested in estimating the mean amount its credit card customers spent on their first visit

sergiy2304 [10]

Answer:

95% Confidence interval: (39.43, 61.58)

Step-by-step explanation:

We are given the following in the question:

Sample mean, $\bar{x}$ = $50.50

Sample size, n = 15

Alpha, α = 0.05

Sample standard deviation = 20

95% Confidence interval:

$\bar{x} \pm t_{critical}\displaystyle\frac{s}{\sqrt{n}}$

Putting the values, we get,

$t_{critical}\text{ at degree of freedom 14 and}~\alpha_{0.05} = \pm 2.1447$

$=50.50 \pm 2.1447(\dfrac{20}{\sqrt{15}} ) \\\\= 50.50 \pm 11.0751 \\= (39.4249,61.5751)\\\approx (39.43, 61.58)$

95% Confidence interval: (39.43, 61.58)

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