Edexcel GCSE Statistics Summarising data overview quiz quiz

What is the mean of the values $2, 4, 6, 8, 10$?

Which average is least affected by extreme outliers?

For the mean of frequency data, you divide $\sum fx$ by what?

A data set has lower quartile $24$ and upper quartile $40$. What is the interquartile range?

What is the standardised score of a value $x$ in a distribution with mean $\mu$ and standard deviation $\sigma$?

A data set has mean $48$, median $54$ and standard deviation $12$. What is its skewness?

Using the quartile rule, what is the upper outlier boundary if $Q_3 = 50$ and $IQR = 10$?

Which measure of spread should be paired with the mean?

For positive skew, which order of the averages is correct?

When estimating the mean of grouped data, what value of $x$ do you use for each class?

What should you always do at the end of a standard deviation calculation?

A value of $90$ is found in a data set with $Q_3 = 60$ and $IQR = 16$. Is it an outlier by the quartile rule?