Daily Practice

Higher

6th August 2024

5 questions · Higher tier · 360 questions in this band

1
The Normal Distribution
IQ scores are normally distributed with mean 100 and standard deviation 15. Out of 1000 people, estimate how many have an IQ above 130.
2
The Binomial Distribution
A quality inspector finds that 10% of bulbs from a factory are faulty. In a random sample of 6 bulbs, find the probability that exactly 1 is faulty.
3
Quality Assurance and Control Charts
Using the same process (mean 100 g, sd 3 g), find the upper and lower action limits (mean plus or minus 3 sd).
4
Spearman's Rank Correlation
Two rankings of 5 items give differences d: 1, -1, 2, -2, 0. Find the sum of d^2.
5
Spreadsheets and ICT (Higher)
Which function counts how many values in the range B2:B50 are equal to 'Yes'?

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