Question 6 - A-Level Maths

Exam Board	OCR MEI
Module	S1 (Statistics 1)
Year	2011
Session	June
Topic	Measures of Location and Spread
Type	Calculate statistics from discrete frequency table

6 The numbers of eggs laid by a sample of 70 female herring gulls are shown in the table.

Number of eggs	1	2	3	4
Frequency	10	40	15	5

Find the mean and standard deviation of the number of eggs laid per gull.
The sample did not include female herring gulls that laid no eggs. How would the mean and standard deviation change if these gulls were included?