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Calculate the mean and standard deviation from the following data

Time (Minutes) to complete an exam: 40, 38, 67, 84, 92, 43, 58, 57, 48, 50, 50, 74, 86Mean: (add up the scores = 787; then divide by the number of participants = 13)

Answered by Annabelle K. • Psychology tutor

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What is DNA?

DNA carries the genetic information that codes for instructions in our body and other organisms. DNA is deoxyribonucleic acid. It is found in the shape of a double helix. The conclusion that DNA is in the...

Answered by Vicky B. • Biology tutor

3091 Views

Explain how physical and human factors contribute to an increased risk of water insecurity.

water insecurity is the result of not having accessible and reliable water stores Human:over abstraction- Israel pollution- chinadams.. less water down stream e.g. Mexico salinisation: over pumping in isr...

Answered by Darcy S. • Geography tutor

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Define Normative Social Influence

Normative Social Influence is when one is influence by the people around them in an effort to be liked and accepted by them, which leads to conformity.

Answered by • Psychology tutor

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A function is defined as f(x) = x / sqrt(2x-2). Use the quotient rule to show that f'(x) = (x-2)/(2x-2)^(3/2)

u = x v = (2x-2)^(0.5)u' = 1 v' = (2x-2)^(-0.5)f'(x) = (vu' - uv') / v^2Therefore, f'(x) = (((2x-2)^(0.5) * 1) - (x * (2x-2)^(-0.5))) / ((2x-2)^(0.5))^2f'(x) = (2x - 2 - x) / (2x-2)^(3/2) = (x-2) / (2x-2)...

Answered by Isaac F. • Maths tutor

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