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A group of 20 values has a mean of 85 and a median of 80. A

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A group of 20 values has a mean of 85 and a median of 80. A [#permalink] New post 30 May 2019, 10:28
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A group of 20 values has a mean of 85 and a median of 80. A different group of 30 values has a mean of 75 and a median of 72.

(a) What is the mean of the 50 values?

(b) What is the median of the 50 values?

[Reveal] Spoiler: OA
(a) mean=79 (b) The median cannot be determined from the information given.


Math Review
Question: 3
Page: 296
Difficulty: medium

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Re: A group of 20 values has a mean of 85 and a median of 80. A [#permalink] New post 13 Oct 2019, 08:00
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Carcass wrote:
A group of 20 values has a mean of 85 and a median of 80. A different group of 30 values has a mean of 75 and a median of 72.

(a) What is the mean of the 50 values?

(b) What is the median of the 50 values?

[Reveal] Spoiler: OA
(a) mean=79 (b) The median cannot be determined from the information given.


Math Review
Question: 3
Page: 296
Difficulty: medium



Here,

Mean of 50 numbers : \(\frac{{(85 * 20 ) +(75 * 30 )}}{50}= \frac{3950}{50} = 79\)

For median we don't have enough information, since median is the middle number and there can be numerous possible values
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A group of 20 values has a mean of 85 and a median of 80. A

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