We have been given two measurements: 7 m and 7.7 m. We are asked to determine which measurement is more precise.
We know that precision is the level of detail of a measurement, determined by the smallest unit. It is fraction of a unit that can be reasonably measured.
We can see that 7.7 is a detailed measurement, therefore, 7.7 is more precise.
The probability that student scored more than 850 we shall proceed as follows: z=(x-μ)/σ where: x=850 μ=750 σ=50 thus z=(850-750)/50 z=2 thus P(x>850)=1-P(x<850)=1-P(z<2)=1-0.9772=0.0228
