Answer:
Your question lacks some parts attached below is the complete question
Answer : 2.66
Explanation:
The expected number ( E ) can be calculated using the formula below
![E = (row total * column total )/(gross total)](https://img.qammunity.org/2021/formulas/mathematics/college/4ttfmp2zyq6p3pese788hezvc6jnhduf8k.png)
since we are computing the number of subjects that would prefer Linux operating system and are also rated as exceptional
The row total to be used = 53 ( row total of exceptional )
The column total to be used = 13 ( column total of Linux )
The gross total to be used = summation of row total of both exceptional and no-exceptional = 259
BACK TO THE EQUATION
E =
= 689 / 259
E = 2.6602 ≈ 2.66