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2 Statistics

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Question 262

The masses x x\,x grams of 28 packages are grouped below.

x0≤x<1010≤x<2020≤x<4040≤x<60frequency61084\begin{array}{c|cccc}x&0\leq x<10&10\leq x<20&20\leq x<40&40\leq x<60\\\hline\text{frequency}&6&10&8&4\end{array}xfrequency​0≤x<106​10≤x<2010​20≤x<408​40≤x<604​​

a.

Calculate an estimate of the mean mass.

[3]
b.

Calculate an estimate of the sample standard deviation.

[3]
Markscheme

2 Statistics Questions

  1. A Level
  2. /Maths
  3. /2 Statistics

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