Two independent measurements are made of the lifetime of a charmed strange meson Each measurement has a standard deviation of 7 10 15 seconds The lifetime of the meson is estimated by averaging the two measurements What is the standard deviation of this estimate ...

Two independent measurements are made of the lifetime of a charmed strange meson. Each measurement has a

Question:

Two independent measurements are made of the lifetime of a charmed strange meson. Each measurement has a standard deviation of 7 × 10⁻¹⁵seconds. The lifetime of the meson is estimated by averaging the two measurements. What is the standard deviation of this estimate?

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