OCR Maths Statistics 1 A+ level
Solutions
Frequency= - ANS-Frequency density × class width
Frequency polygon - ANS-Join the midpoints of the top of the bars
Cumulative frequency is plotted... - ANS-at the upper bound
Median - ANS-½(n+1)th value
x̄= - ANS-∑(x-a)/n + a
Interquartile range= - ANS-Upper quartile - lower quartile
Positive skew - ANS
Negative skew - ANS
Outlier - ANS-1.5 times the interquartile range, above the upper quartile or below the
lower quartile
Variance: σ² - ANS
Standard deviation: σ - ANS-It is the square root of variance
Variance of data in a frequency table - ANS-∑x²f/∑f - x̄²
Sample space - ANS-All the possible outcomes
If A is an event, A' is the complement of A - ANS-P(A) + P(A') = 1
Addition law of mutually exclusive events - ANS
Conditional probability - ANS
Solutions
Frequency= - ANS-Frequency density × class width
Frequency polygon - ANS-Join the midpoints of the top of the bars
Cumulative frequency is plotted... - ANS-at the upper bound
Median - ANS-½(n+1)th value
x̄= - ANS-∑(x-a)/n + a
Interquartile range= - ANS-Upper quartile - lower quartile
Positive skew - ANS
Negative skew - ANS
Outlier - ANS-1.5 times the interquartile range, above the upper quartile or below the
lower quartile
Variance: σ² - ANS
Standard deviation: σ - ANS-It is the square root of variance
Variance of data in a frequency table - ANS-∑x²f/∑f - x̄²
Sample space - ANS-All the possible outcomes
If A is an event, A' is the complement of A - ANS-P(A) + P(A') = 1
Addition law of mutually exclusive events - ANS
Conditional probability - ANS
