The following data represent scores on a pop quiz in a statistics section: 
Suppose the data are grouped into five classes,and one of them will be "30 up to 44." that is,{x;30 ≤ x < 44}.The frequency of this class is _____.
Definitions:
Racism
A system of prejudice and discrimination based on race, where societal beliefs and practices create unequal opportunities and treatment for racial groups.
Henry Highland Garnet
An African American abolitionist, minister, and orator known for advocating the violent overthrow of slavery.
Slaves Revolts
Uprisings by enslaved people against their captors and the oppressive systems of slavery, often aiming for freedom and significant changes.
Free Speech
The right to express any opinions without censorship or restraint.
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