2 years ago

In a group of 30 children, 80%can’t swim how many children can’t swim

Mathematics

2 answers:

adoni [48]2 years ago

8 0

Answer:

Step-by-step explanation:

Allushta [10]2 years ago

3 0

80% is 0.8
30x0.8 is 24
So 24 cant swim

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larisa86 [58]

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Step-by-step explanation:

Consider the provided information,

A sample of 49 customers. Assume a population standard deviation of $5. If the sample mean is $24.80,

The confidence interval if 99%.

Thus, 1-α=0.99

α=0.01

Now we need to determine $z_{\frac{\alpha}{2}}=z_{0.005}$

Now by using z score table we find that $z_{\frac{\alpha}{2}}=2.58$

The boundaries of the confidence interval are:

$\mu-z_{\frac{\alpha}{2}}\times \frac{\sigma}{\sqrt{n} }\\24.80-2.58\times \frac{5}{\sqrt{49}}=22.96\\\mu+z_{\frac{\alpha}{2}}\times \frac{\sigma}{\sqrt{n} }\\24.80+2.58\times \frac{5}{\sqrt{49}}=26.64$

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dalvyx [7]

Answer:

7x3=21

Step-by-step explanation:

pls mark Brainliest :)

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3 years ago

Justine earned $26,000 during the first year of her job at city hall. After each year she received a 3% raise. Find her total ea

hichkok12 [17]

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