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alexandr402 [8]

3 years ago

14

One hour after yolanda started walking from x to y, a distance of 45 miles, bob started walking along the same road from y to x.

if yolanda's walking rate was 3 miles per hour and bob's was 4 miles per hour, how many miles had bob walked when they met?]

1 answer:

Rufina [12.5K]3 years ago

3 0

<span>Answer: When bob starts walking The distance between them is 45-3 = 42 miles If they meet at time t then Yolanda would have walked X/3 minutes and Bob would have walked (42-X)/4 mins X/3 = (42-X)/4 so X = 18 Bob would have walked 42-18 = 24 miles.</span>

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Hi!

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8 0

2 years ago

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:

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$\mu = 20$ --- population mean

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Required

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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 $\bar_x$

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$x = \frac{1}{2}$

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So, we have:

$P(x \le 21) = P(z \le 0.50)$

From the z table

$P(z \le 0.50) = 0.69146$

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$P(x \le 21) = 0.69146$

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