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GalinKa [24]
3 years ago
6

Sarah said that when you multiply two fractions that are both less than 1, you may sometimes get a product equal to or greater t

han 1.
is sarah's statement true why or why not? please use some fractions to prove or disprove sarah's statement
Mathematics
2 answers:
blsea [12.9K]3 years ago
6 0

Answer:

Sarah's statement is false.

Step-by-step explanation:

If a fraction is less than 1, it means that its numerator is less than its denominator.

So, if we multiply two fractions both are less than 1, then, numerators of both the fractions are less than their denominators.

Hence, in the resultant fraction, the numerator is less than the denominator and hence its value is less than 1.

sveticcg [70]3 years ago
5 0

Answer:

Sarah's statement is not true and it is explained with the help of  counter example.    

Step-by-step explanation:

Sarah gave a statement that the product of two fraction whose value is smaller than 1 gives a product of 1 or greater than 1.

No, this may not always be true. In fact product of two fractions whose value are less than 1 is always smaller than 1.

This can be explained with the help of a counter example:

1)

\displaystyle\frac{1}{2} < 1\\\\\displaystyle\frac{1}{2}\times \displaystyle\frac{1}{2} = \displaystyle\frac{1}{4} < 1

2)

\displaystyle\frac{3}{4}, \displaystyle\frac{2}{4} < 1\\\\\displaystyle\frac{3}{4}\times \displaystyle\frac{2}{4} = \displaystyle\frac{6}{16} < 1

3)

\displaystyle\frac{3}{4}, \displaystyle\frac{4}{7} < 1\\\\\displaystyle\frac{3}{4}\times \displaystyle\frac{4}{7} = \displaystyle\frac{3}{7} < 1

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he blood platelet counts of a group of women have a​ bell-shaped distribution with a mean of 247.3 and a standard deviation of 6
Ulleksa [173]

Answer:

The approximate percentage of women with platelet counts within 3 standard deviations of the​ mean is 99.7%.

Step-by-step explanation:

We are given that the blood platelet counts of a group of women have a​ bell-shaped distribution with a mean of 247.3 and a standard deviation of 60.7.

Let X = <em>t</em><u><em>he blood platelet counts of a group of women</em></u>

The z-score probability distribution for the normal distribution is given by;

                                Z  =  \frac{X-\mu}{\sigma}  ~ N(0,1)

where, \mu = population mean = 247.3

           \sigma = standard deviation = 60.7

Now, according to the empirical rule;

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Since it is stated that we have to calculate the approximate percentage of women with platelet counts within 3 standard deviations of the​ mean, or between 65.2 and 429.4, i.e;

         z-score for 65.2 =  \frac{X-\mu}{\sigma}

                                     =  \frac{65.2-247.3}{60.7}  = -3

         z-score for 429.4 =  \frac{X-\mu}{\sigma}

                                       =  \frac{429.4-247.3}{60.7}  = 3

So, it means that the approximate percentage of women with platelet counts within 3 standard deviations of the​ mean is 99.7%.

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3 years ago
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