What is the value of (-1/4 - 1/2) divided by (-4/7) ?

Mathematics

2 answers:

torisob [31]3 years ago

6 0

Answer:

1 5/16 (1 and 5/16)

crimeas [40]3 years ago

3 0

Answer:

d.)

Step-by-step explanation:

Start with the brackets first.

(−1/4−1/2) = −1−2 ÷4 = −3/4

Hence we get:

−3/4÷(−4/7)

which is equal to

-3/4×(−7/4) −3/4×(−7/4) = 21/16

which then u convert 21/16 into a mixed fraction to get 1 5/16

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A researcher is interested in the lengths of brook trout, which are known to be approximately Normally distributed with mean 80

aliya0001 [1]

Answer:

$P(X$

And we can find this probability with the normal standard distirbution or excel and we got:

$P(z$

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

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Solution to the problem

Let X the random variable that represent the lenghts of a population, and for this case we know the distribution for X is given by:

$X \sim N(80,5)$