期望值 (qī wàng zhí) — expected value (in probability and statistics)

Definition

noun

expected value (in probability and statistics)

Examples

期望值。
Jì suàn zhè ge wèn tí de qī wàng zhí xū yào zhī dào suǒ yǒu kě néng de jié guǒ.
To calculate the expected value of this problem, you need to know all possible outcomes.
，期望值。
Zài tóu zī zhōng, qī wàng zhí shì yí gè zhòng yào de gài niàn.
In investment, expected value is an important concept.
期望值。
Wǒ men gēn jù qī wàng zhí lái xuǎn zé zuì hǎo de fāng àn.
We choose the best plan based on expected value.

Origin

Compound word

构词法gòucífǎ

偏正piānzhèngModifier + head

The first part narrows down the second: it says what kind of thing the head is.

期望expectation

期qīexpect望wànghope

联合Coordinate

值zhívalue

期 and 望 both point to expectation, while 值 gives a numerical value.

Characters in this word

Most characters — around four in five — are built this way: one part hints at the meaning, the other at the pronunciation.

Meaning part形符xíngfú

日日rì

Sound part声符shēngfú

其

其qí期qī

Same sound today

The original form paired 其 for its sound with 日 (sun). A related form changed that sun to 月, and this later developed into 期.

Open 期 →

Two or more meaningful parts placed together so that their meanings combine into a new one.

臣臣chéneye
𡈼𡈼𡈼person standing on the ground

望 originally showed 臣 (eye) beside 𡈼 (person standing on the ground): a person standing up and looking off into the distance. Later 月 was added, and the 臣 part became 亡.

Open 望 →

Most characters — around four in five — are built this way: one part hints at the meaning, the other at the pronunciation.

亻直值

Meaning part形符xíngfú

亻Written in full as人rén

Sound part声符shēngfú

直

直zhí值zhí

Same sound today

值 is made from 亻 (written in full as 人, a person) and 直, with 直 giving the sound.

Open 值 →

Appears in