85,86,89,35,60,57,89,75,65find me the mean

Mathematics

1 answer:

kvasek [131]3 years ago

7 0

Answer:

the answer is 71.2

Step-by-step explanation:

add all the numbers up and divide by the total amount of score

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Pentagon ABCDE is a regular polygon. The length of side BC is represented by 3x - 4. The length of side DE is represented by the

dimulka [17.4K]

Answer:

Length of side AB = 5

Step-by-step explanation:

A regular polygon is one in which all angles are equal and all the sides have the same length.

Now, it means that;

AB = BC = CD = DE = AE

We are told that BC is represented by 3x - 4 while DE is represented by the expression 4x - 9.

Thus, from equal length of sides of a regular polygon, we have;

3x - 4 = 4x - 9

4x - 3x = 9 - 4

x = 5

Thus, length of BC = 3(5) - 4 = 15 - 4 = 11

Therefore, Length of AB = 5

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3 years ago

Bear has $500 in his savings account, and Mrs. Killcrease has $900 in hers. Bear is adding $50 per month, whereas Mrs. Killcreas

Sladkaya [172]

Answer: they meet at $20$ months. Bear: $50x20=1000$ $1000+500=1500$ Mrs. Killcrease: $30x20=600$ $900+600=1500$

Step-by-step explanation:

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3 years ago

There is a 10% chance of the mean oil-change time being at or below the sample mean for which there is an area of 0.10 to the

Zarrin [17]

The probability that a normally distributed data with a mean of μ and a standard deviation of σ is less than a value x is given by:

$P(X\ \textless \ x)=P\left(z\ \textless \ \frac{x-\mu}{\sigma} \right)$

Given that μ = 16.5 and σ = 0.804984 and that the probability that the <span>mean oil-change time being at or below the sample mean for which there is an area of 0.10 to the left under the normal curve, then:

$P\left(z\ \textless \ \frac{x-16.5}{0.804984} \right)=0.1\\ \\ \Rightarrow P\left(z\ \textless \ \frac{x-16.5}{0.804984} \right)=P(z\ \textless \ -1.281) \\ \\ \Rightarrow\frac{x-16.5}{0.804984}=-1.281 \\ \\ \Rightarrow x-16.5=-1.281(0.804984)=-1.031 \\ \\ x=-1.031+16.5=15.47$ </span>