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Burka [1]
3 years ago
15

75 people to 25 people what is the percentage of the change?

Mathematics
2 answers:
garri49 [273]3 years ago
7 0
75-25=50
50/75= 66.67% decrease
Sphinxa [80]3 years ago
3 0
25/75 *100 =33.33% percentage of current people
therefore,  percentage change= 100%-33.33%= 66.666%
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what is the probability of seeing a sample mean for 21 observations less or equal to the sample mean that we observed
kramer

Answer:

P(x \le 21) = 0.69146

Step-by-step explanation:

The missing parameters are:

n = 64 --- population

\mu = 20 --- population mean

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Required

P(x \le 21)

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\sigma_x = \frac{\sigma}{\sqrt n}

\sigma_x = \frac{16}{\sqrt {64}}

\sigma_x = \frac{16}{8}

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Next, calculate the sample mean \bar_x

\bar x = \mu

So:

\bar x = 20

So, we have:

\sigma_x = 2

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So, we have:

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From the z table

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So:

P(x \le 21) = 0.69146

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