数据的离散程度包括（）等指标A、全距B、方差C、标准差D、平均数_爱下问搜题

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问题多项选择题

数据的离散程度包括（）等指标

A、全距

B、方差

C、标准差

D、平均数

答案

参考答案：A, B, C

选择题

给下列的单词选择其正确的过去式。

( ) 1. go
( ) 2. see
( ) 3. have
( ) 4. eat
( ) 5. am

A. had
B. was
C. ate
D. saw
E. went

单项选择题

A Trip to the Forest

One day Bob took two of his friends into the mountains. They put up their tents(帐篷) and then rode off to a forest to see how the trees were growing.
In the afternoon when they were about ten kilometres from their camp(营地), it started to snow. More and more snow fell. Soon Bob could hardly see his hands before his face. He could not find the road. Bob knew there were two roads. One road went to the camp,and the other went to his house. But all was white snow. Everything was the same. How could he take his friends back to the camp
Bob had an idea. The horses! Let the horses take them back! But what would happen if the horses took the road to his house That would be a trip of thirty-five kilometres in such cold weather!
It was getting late. They rode on and on. At last the horses stopped. Where were they None of them could tell. Bob looked around. What was that under the tree It was one of their tents!

Bob and his two friends went to the forest to watch the trees in the forest.
[A] Right. [B] Wrong. [C] Doesn’t say.