The histogram shows the waiting times, $t$ minutes, of 40 customers. The class intervals are \(0&l

Question

The histogram shows the waiting times, $t$ minutes, of 40 customers. The class intervals are $0<t\leq10$, $10<t\leq20$, and so on. State the modal class interval.[1] Find the percentage of customers who waited more than 30 minutes.[2] Explain why the exact range of the waiting times cannot be found from this histogram.[1]

Accepted Answer

(a) $20<t\leq30$ (b) $40\%$ (c) The exact extreme values are unknown.

Equal-interval histograms

Equal-interval histograms

Solution:

Solution locked