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3 years ago

Use your calculator to work out

Mathematics

1 answer:

eimsori [14]3 years ago

4 0

9514 1404 393

Answer:

answer: 83.6155157107

Step-by-step explanation:

See attached.

Most calculators will require that you enclose the numerator in parentheses. You may or may not need to do that for the square root function and denominator as well.

_____

My calculator uses RPN, so the sequence of keys would be ...

16 . . . x^2

17 . . . - (minus) . . . displaying 239

2.3 . . . enter

5.87 . . . + . . . displaying 8.17

√ . . . . displaying 2.85832118559

÷ . . . . displaying 83.6155157107

This kind of calculator gives me complete control over the way the calculation is done, so no parentheses are needed. (The number 239 simply waits for the ÷ operation.)

Some "algebraic" calculators do not conform to the Order of Operations, and some do not have enough memory for pending operations. The manual doesn't always point out the limitations.

I like the G.oogle calculator because it is guaranteed to conform to the Order of Operations. That requires you to know where to use parentheses. Its final display always uses parentheses to show exactly how it did the computation.

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A value of two standard deviation from the mean is more likely to occur than a value three standard deviations from the mean

Anvisha [2.4K]

This is true. The closer to the mean that a value is, the more likely it is to occur.

In this case, two and three standard deviations away are both fairly unlikely, however, two is still more likely to occur than three.

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Glenda receives a salary of $4,792 bimonthly. Find Glenda’s earnings per year.

Andre45 [30]

Answer: $28,752

Explanation:

The definition of bimonthly is an event that happens once in two months. $-bi$ represents "two", while $-monthly$ represents "event that happens by month.

Given that Glenda receives a salary of $4,792 bi-monthly, we are required to find the earnings per year.

There are 12 months in each year, and if the given value is a 2-month value, then we shall divide 12 by 2 to find that there is in total 6 of the 2-month value.

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Finally, we shall multiply the total number with the salary, which will be $4,792 times 6.

$4792*6=\boxed{28752}$

Hope this helps!! :)

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3 years ago

A bag contain 5 red marbles,4 green marbles and 1 blue marble. A marble is chosen at random from the bag and not replaced; then

jarptica [38.1K]

Answer:

$\frac{2}{15}$

Step-by-step explanation:

GIVEN: A bag contain $5$ red marbles, $4$ green marbles and $1$ blue marble. A marble is chosen at random from the bag and not replaced, then a second marble is chose.

TO FIND: What is the probability both marbles are green.

SOLUTION:

Total marbles in bag $=10$

total number of green marbles $=4$

Probability that first marble will be green $P(A)=\frac{\text{total green marbles}}{\text{total marbles}}$

$=\frac{4}{10}=\frac{2}{5}$

Probability that second marble will be green $P(B)=\frac{\text{total green marble in bag}}{\text{total marble in bag}}$

$\frac{3}{9}=\frac{1}{3}$

As both events are disjoint

probability both marbles are green $=P(A)\times P(B)$

$=\frac{2}{5}\times\frac{1}{3}=\frac{2}{15}$

Hence the probability both marbles are green is $\frac{2}{15}$

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3 years ago

How do you write 22.5% as a fraction in simplest form?

Darya [45]

Answer: 9/40

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So here, 22.5% can be written as the ratio 22.5 to 100 or 22.5/100.

Notice however that 22.5/100 is not in lowest terms so we need to multiply the numerator and the denominator of 22.5 by 10 in order to remove the decimal point. When we do this, we will end up with the fraction 225/1000.

The fraction 225/1000 can be written in lowest terms by dividing both the numerator and the denominator by 25 and we get the fraction 9/40.

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