Question about super large number units in hubbles constant

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SUMMARY

The Hubble constant is measured at 74.2 ± 3.6 (km/s)/Mpc, indicating that the true value lies within the range of 70.6 to 77.8 (km/s)/Mpc. The "±" symbol denotes the error bounds associated with the measurement, which arise from methodological and instrumental uncertainties. Understanding these error bounds is crucial for interpreting astronomical data accurately, similar to how one would account for measurement errors when using a ruler.

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This is hubbles constant from my source
74.2 ± 3.6 (km/s)/Mpc


What does the ± mean?
 
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That means that the value of the Hubble constant lies somewhere in the range of 74.2 -3.6 and 74.2 + 3.6. Every measured quantity has errors due to method and instrumentation called the error bounds.

For example, when using a ruler we usually assume an error equal to 1/2 the smallest division mark. Let's say you use a standard meter stick for a measurement of 10cm. Your error bound would be specified by 10 +/- .05 cm
 

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