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nalin [4]
3 years ago
11

Chris has 96 local and foreign stamps altogether in his collection. The ratio of the number of local stamps to foreign stamps is

1 : 3. How many local stamps does Chris have?​
Mathematics
1 answer:
Anna [14]3 years ago
3 0

Answer:

Chris have 24 local stamps

Step-by-step explanation:

We are given that  The ratio of the number of local stamps to foreign stamps is 1 : 3.

Let the ratio be x

Number of local stamps = x

Number of foreign stamps = 3x

Total Number of stamps =x+3x=4x

We are given that Chris has 96 local and foreign stamps altogether in his collection

So, 4x=96

x=\frac{96}{4}

x=24

Hence Chris have 24 local stamps

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0.0721 = 7.21% probability that the mean height for the sample is greater than 65 inches.

Step-by-step explanation:

To solve this question, we need to understand the normal probability distribution and the central limit theorem.

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

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The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

Central Limit Theorem

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For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

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This means that \mu = 64.4, \sigma = 2.91

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This means that n = 50, s = \frac{2.91}{\sqrt{50}}

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Z = \frac{X - \mu}{\sigma}

By the Central Limit Theorem

Z = \frac{X - \mu}{s}

Z = \frac{65 - 64.4}{\frac{2.91}{\sqrt{50}}}

Z = 1.46

Z = 1.46 has a p-value of 0.9279

1 - 0.9279 = 0.0721

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