A supermarket polled 1,000 customers regarding the size of their bill. The results are given in the table below.

Size of BillNumber of Customers

Below $20.00207

$20.00-$39.99114

$40.00-$59.99185

$60.00-$79.99176

$80.00-$99.99193

$100.00 or above125

Use probability rules (when appropriate) to find the relative frequency with which a customer's bill is as stated. (Enter your answers as fractions.)

(a) less than $40.00

(b) $40.00 or more