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qwelly [4]
3 years ago
10

The annual precipitation amounts in a certain mountain range are normally distributed with a mean of 78 inches, and a standard d

eviation of 16 inches. what is the probability that the mean annual precipitation during 64 randomly picked years will be less than 80.8 inches?
Mathematics
1 answer:
quester [9]3 years ago
7 0

The sample mean is μ=78, and sample standard deviation is σₓ=σ/\sqrt{n}=16/\sqrt{64}=2.

The Z-score is Z=\frac{80.8-78}{2} =1.4.

The required probability

P(X

Refer to standard normal distribution table.

P(Z

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4 0
3 years ago
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4) During a school carnival, students from the middle school raised money by selling crafts, food, game tickets, and school play
ioda

$225 was earned from the craft sales

and $40 was earned from the play.

Given, During a school carnival, students from the middle school raised money by selling crafts, food, game tickets, and school play admissions.

Of each dollar earned, $0.15 came from games. Craft sales earned 3 times as much as games. Food sales were 4 times the amount earned from the play.

Let the amount earned by play be x,

Now, Games earned = 0.15×500 = $75

Also, crafts earned 3×75 = $225

Now, as play earned x, then food earned 4x.

According to question,

x + 75 + 225 + 4x = 500

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x = 40

So, the amount earned by Play be, $40

and the amount earned by Food be $160.

Hence, $225 was earned from the craft sales

and $40 was earned from the play.

Learn more about Linear Equations here brainly.com/question/24085666

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5 0
1 year ago
Sixth grade<br> R.<br> Are the ratios 5:10 and 2:4 equivalent?
Alinara [238K]

Yes, 5:10 and 2:4 are equivalent.

5:10 (simplified) = 1:2

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Hope this helps; have a great day!

4 0
3 years ago
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