To determine the value of [tex]\( X \)[/tex], we need to analyze the table and focus on the row "English Only".
The table gives us the following information under the "English Only" category:
- The proportion of students who scored 90 or above in English and studied only English: [tex]\( 0.12 \)[/tex]
- The proportion of students who scored lower than 90 in English and studied only English: [tex]\( 0.28 \)[/tex]
To find the total proportion of students who studied only English (regardless of their English grade), we need to add these two proportions together:
[tex]\[
X = 0.12 + 0.28
\][/tex]
When we perform the addition:
[tex]\[
X = 0.40
\][/tex]
Thus, the value of [tex]\( X \)[/tex] is [tex]\( \boxed{0.40} \)[/tex].
