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Elenna [48]
3 years ago
14

At a local preschool, there is a ratio of three boys two every four girls. If there are 245 total preschoolers enrolled , Then h

ow many are boys
Mathematics
1 answer:
White raven [17]3 years ago
5 0

A ratio can be written in three different ways: 3 to 4, 3:4, and 3/4

What does this mean? It means that for every group of 7 students (3+4) there are 3 boys and 4 girls. And how many groups do we have? We have:

245/7= 35 We have 35 groups, and we just said that each group has 3 boys and 4 girls:

35*3= 105 boys

35*4= 140 girls

_ _ _---------

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For a normal distribution with a mean of 16 and a standard deviation of 3, find the 50th percentile. Can someone please explain
andrew11 [14]
The probability distribution of normal distribution is given by,

f(x) = \frac{1}{{ \sqrt{2 \pi  \alpha ^{2} } }} e^{ \frac{-(x-a)^{2} }{2 \alpha^{2} } }

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4 years ago
Motorola used the normal distribution to determine the probability of defects and the number of defects expected in a production
Lena [83]

The question supplied is incomplete :

The x parameters aren't given ; "Units with weights less than or greater than ounces will be classified as defects"

Assume the unit weights Given are ;

Units with weights less than 10.8 or greater than 11.2 ounces will be classified as defects

Just follow the procedure in the solution for any value of unit weight interval given.

Answer:

0.3173

Step-by-step explanation:

Mean weight, m = 11 ounces

Standard deviation, s = 0.2 ounces

Find the Zscore for each unit weight :

Z = (x - mean) / standard deviation

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Z = (10.8 - 11) / 0.2 = - 1

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Hence, Probability of a defect is 0.3173

7 0
3 years ago
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