Each object in the stated selection population is equally likely to be selected. The masses of 50 st

Question

Each object in the stated selection population is equally likely to be selected.

The masses of 50 students are grouped as follows: $35<x\le40:7$, $40<x\le45:18$, $45<x\le50:13$, $50<x\le55:8$, $55<x\le60:4$. Find the probability that a selected student has mass

at most 35 kg,[1]
not more than 45 kg,[1]
more than 40 kg but not more than 55 kg.[1]

Accepted Answer

(i) $0$ (ii) $\frac{1}{2}$ (iii) $\frac{39}{50}$.

Probabilities from grouped mass data

Probabilities from grouped mass data

Solution:

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