A discrete random variable $Y\,$ has a distribution that is approximately symmetric and bell-shaped, with mean 90 and variance 72. It is modelled by $X∼N(90,72)X\sim N(90,72)$ .

Use a continuity correction to estimate $P(80≤Y≤100)P(80\leq Y\leq100)$ .

State one reason why the quality of this approximation should be checked using the original distribution.

A discrete random variable $Y\,$ has a distribution that is approximately symmetric and bell-shaped, with mean 90 and variance 72. It is modelled by $X∼N(90,72)X\sim N(90,72)$ .

Use a continuity correction to estimate $P(80≤Y≤100)P(80\leq Y\leq100)$ .

State one reason why the quality of this approximation should be checked using the original distribution.

2 Statistics

Question 334

Markscheme

2 Statistics

Question 334

Markscheme

2 Statistics

Question 334

2 Statistics Questions

2 Statistics

Question 334

2 Statistics Questions