Respuesta :
This is an incomplete question, here is a complete question.
Bud N. Chemist must determine the density of a mineral sample. His four trials yield densities of 4.77 g/cm³, 4.67 g/cm³, 4.69 g/cm³, and 4.81 g/cm³. Independent studies found the correct density to be 4.75 g/cm³. Which of the following statements represents the best analysis of the data?
A)Bud's results have much greater accuracy than precision.
B)Bud's results have much greater precision than accuracy.
C)Bud's results have high accuracy and high precision.
D)Bud's results have low accuracy and low precision.
E)Bud's equipment is faulty.
Answer : The correct option is, (A)Bud's results have much greater accuracy than precision.
Explanation :
Accuracy : It is defined as the closeness of a measured value to a standard or known value.
For Example: If the mass of a substance is 50 kg and one person weighed 48 kg and another person weighed 55 kg. Then, the weight measured by first person is more accurate.
Precision : It is defined as the closeness of two or more measurements to each other.
For Example: If you weigh a given substance five times and you get 1.8 kg each time. Then the measurement is said to be precise.
Level of precision is determined by the maximum number of decimal places.
When the level of precision is very very less, the measurement can be considered as most precise and most accurate.
As we are given that the actual value of the density of substance is 4.75 g/cm³ and the values measured by a chemist are, 4.77 g/cm³, 4.67 g/cm³, 4.69 g/cm³, and 4.81 g/cm³.
From the trial values of density of a substance we conclude that their results have much greater accuracy than precision because the measured value are close to the standard or known value.
Hence, the correct option is, (A)
