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Does a set of values mean the same as an observation?
No. One observation will normally get you onevalue, not a set of values. Also, to be precise, the observation is the act of observing; the value is the result of the observation, not the observation itself.
If you measure the mass of an object four times and get values that are very close to each other the measurements are said to be?
If you take a measurement multiple times, and get similar values each time, then the data is said to be very precise. If this group of data is very close to the expected value, then the data is said to be accurate. However, a set of data may be precise without being accurate if the measured values are all similar to one another, but not close to the expected value.
What is the value of an uncirculated penny set 1938 to 1959 71 coins?
The set needs to be seen for an accurate value. A complete set of Lincoln cents from 1938 to 1959 has 62 coins in it.
Why is an average or mean important?
They are the same thing. They give you an accurate representation of all the values in a data set
Which set of tools will provide the most precise measurements for calculating the density of an irregulary shaped rock?
It depends on the size and mass of the rock. For a "normal" rock (as opposed to merely a stone) I suggest a crane with some means for measuring the rock's mass. A number of pulleys, each with a weighing machine should do the trick. Alternatively, you could use a weighbridge, if there is one in the vicinity. To obtain its volume, you probably need a 3-d laser-profiling device. That should give the most precise measurement of its volume.
