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3 years ago

41/21÷8/23 am having aproblem with fractions need help

2 answers:

8 0

Change divide sign to multiplication sign, and flip second fraction
= 41/21 × 23/8

multiply top numbers together and multiply bottom numbers together
= (42×23)/(21×8)
=943/168

Tanya [424]3 years ago

6 0

You can do the multiplicative inverse by mutiplying 41/21 and 8/23. But, you have to switch the second number to 23/8. Once it's switched, you just multiples straight across. So, it is 943/168. Just simplify it

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The mean number of words per minute (WPM) typed by a speed typist is 149149 with a standard deviation of 1414 WPM. What is the p

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The probability is $P(\= X > x ) = 0.78814$

Step-by-step explanation:

From the question we are given that

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The probability that the sample mean would be greater than $P(\= X > x ) = P( \frac{ \= x - \mu }{\sigma_{\= x} } > \frac{ x - \mu }{\sigma_{\= x} } )$

Generally the z- score of this normal distribution is mathematically represented as

$Z = \frac{ \= x - \mu }{\sigma_{\= x} }$

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substituting values

$\sigma_{\= x } = \frac{14 }{\sqrt{88} }$

$\sigma_{\= x } = 1.492$

Which implies that

$P(\= X > x ) = P( Z > \frac{ 147.81 - 149 }{ 1.492} )$

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3 years ago

Find the compound interest and final amount $950 for 2 years at 7½ per annum

wlad13 [49]

Answer:

1092.50 account value

142.50 interest

Step-by-step explanation:

to solve compound interest questions we use the formula A=P(1+rt) where P is the principal (initial investment) r is the rate or the return (7.5%) and t is the interval or time so 2 years

now putting it together we get A=950(1+ (7.5x2)) = 1092.50 $

the interest is this value A minus the initial investmetn so 1092.50 - 950 = 142.50$

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