need standard deviation

need standard deviation

i have four choices, but i don't know where to begin, except to work backward and plug in the answers. i would like to understand without getting choices

The concentration of hydrogen ions in household dish detergent is 10-12. What is the pH level of household dish detergent?

Malcolm's parents put $1,200 into a savings account when he was born in 2006. every birthday, Malcolm's parents deposit 10% more than the previous year. Determine the explicit formula for the...

Malcolm's parents put $1,200 into a savings account when he was born in 2006. every birthday, Malcolm's parents deposit 10% more than the previous year. Determine the explicit formula for the...

Which of the following does the situation below best describes? ~the enrollment at a high school does not change for 3 years in a row. A.the domain of a function b.a relation that is not a function...

help please

An equilateral triangle is inscribed in the unit circle. find the exact perimeter of the equilateral triangle.

An earthquake of a magnitude 9.1 occurred in 2004 in the Indian Ocean near Indonesia. It was bout 74,900 times as strong as the greatest earthquake ever to hit Texas. Find the magnitude of the Texas...

An earthquake of magnitude 7.7 occurred in 2001 in Gujarat, India. It was about 4900 times as strong as the greatest earthquake ever to hit Pennsylvania. What is the magnitude of the Pennsylvania...

Evaluate sin(sin-1(sin60)) [60 degrees] and evaluate cos-1(cos(cos-10.5)) if the angle is in quadrant 1.

The perimeter of a rectangle is 34 units, its width is 6.5 units. Write an equation to determine the length (l) of the rectangle.

I don't understand how to work this oriblem

Have a test tomorrow. I'm struggling a bit with my fraction problems. I know to set both denominators equal and subtract but I do not now how or where to go from that point. Any and all help is appreciated...

The foreman of a construction team puts up a sound barrier that reduces the intensity of the noise by 50%. By how many decibels is the noise reduced? Use the formula L=10LogI/I0 to measure the...

solve with quadratic formula

working with the Discriminant

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How would I model the formula to find the average and minimum/maximum?

An equilateral triangle is inscribed in the unit circle. find the exact perimeter of the equilateral triangle.