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vichka [17]
2 years ago
14

The mean of 100 observation is found to be 40. If at the time of compution two items were wrongly taken as 30 and 27 instead of

3 and 72. Find the correct mean
Mathematics
1 answer:
Colt1911 [192]2 years ago
7 0

Answer:

40.18

Step-by-step explanation:

According to this question, the mean of 100 observation is found to be 40. This means that the number of values in the set of data is 100. However, at the time of computation two items were wrongly taken as 30 and 27 instead of 3 and 72.

The mean is derived by dividing the sum of values in the data (Σx) by the number of observations (n) i.e.

Mean = Σx/n

For the computation error:

Mean = 40

Let x represent the sun of other 98 values except 30 and 27

n = 100

40 = x + 30 + 27/100

40 = 57 + x/100

Cross multiply

4000 = 57 + x

x = 4000 - 57

x = 3943.

Sum of other 98 values = 3943.

Now, let's find the correct mean with correct values of 3 and 72;

Mean = Σx/n

Mean = 3943 + 3 + 72/100

Mean = 4018/100

Mean = 40.18

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Vera_Pavlovna [14]

Answer:

22

Step-by-step explanation:

Evaluate!

5(5)-3

25-3

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6 0
3 years ago
En una pension de perros hay tres perros que pesan 20kg 10kg y otro 5kg si se contempla que 70kg de alimento dura 2 meses¿que ca
aleksley [76]

Answer:

40kg

20kg

10kg

Step-by-step explanation:

The computation of the food each one is getting as follows

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And, the food is 70 kg

So, each one is getting

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For 10 kg

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And, for 5 kg

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7 0
2 years ago
Tires are rotating at a rate of 32 revolutions per minute. Find the angular speed of the tires in radians per minute.
Anni [7]

Answer:

201.1 radians per minute

Step-by-step explanation:

The formula for Angular speed of tires in radians per minute =

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x = 32 revolutions per minutes × 2 π radians per minute

x = 201.06192983 radians per minute

Approximately

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4 0
3 years ago
The diagonals of a parallelogram bisect each other.
Montano1993 [528]
each diagonal cuts the other into two equal parts.
7 0
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When mushrooms are dried, they lose 80 percent of their mass. What weight of mushrooms must be picked to get 1 kg of dry mushroo
kaheart [24]

Answer:

We need to start with 5 kg of mushrooms

Step-by-step explanation:

The total of the dried mushrooms = mushrooms *  percentage of weight kept

percentage of weight kept = 1- 80% = 20 %

We want 1 kg of dried mushrooms.   Substitute in what we know

1 kg = mushrooms * 20%

1 kg  = mushrooms * .2

Divide  each side by .2

1 /.2 = mushroom *.2 /.2

5 kg = mushrooms

We need to start with 5 kg of mushrooms

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